Jump to content

Australian Red Claw High Nitrates and Nitrites


ScubaTron
 Share

Recommended Posts

Hi,

I am new to this forum, but it looked like the perfect place to hopefully get the help that I need. I also hope that I am posting in the correct place with relevant information as I'm not a big forum writer but possibly will write more now that I have the time.

I currently have a large lobster setup that I wish to hopefully turn into a breeding setup in Malaysia. I have about 40 Australian red claw crayfish and they have been in the tank now for just over 1 month. At first I have a few fatalities (from not cycling the tank long enough). But it's now been almost 2 months that the tank has been running and I just can't seem to get the nitrates or nitrites under control. The volume is about 300 liters with 3 sections. The main large section where most of the crayfish are has 1 pump going directly into a pressurised canister filter that I made. There is also another pump running alone for water flow (and to stop mosquito's breeding). The top section is the main box filter that has bio balls in the bottom, then sponge medium and coral fragments followed with sponge on the top. I have also been using some probiotics to encourage nitrifying bacteria to start. The middle section has 4 females (about 4 inches each) and 1 male (about 3 inches). I have 2 fairly good size pieces of driftwood in there too. My pH is at 7.8 (trying to get this down a little bit too).

 

 

Any suggestions would be much appreciated on how I can lower my nitrites and nitrates.

IMG_20160912_124120.jpg

IMG_20160912_124132.jpg

IMG_20160912_124145.jpg

Edited by ScubaTron
  • Like 1
Link to comment
Share on other sites

Welcome to SKF !! :welcome:

 

Hmm, the water might need to be in longer contact with the biological filter media before flowing down to the next level. 

looking at photos 2 & 3, it seems like the water from the bottom tub doesn't flow through much of the media before exiting to the next tub down. 

47 minutes ago, ScubaTron said:

The top section is the main box filter that has bio balls in the bottom, then sponge medium and coral fragments

What sort of bio balls do you use? Those plastic ones?

There are a much better bio media around. You need more surface area for beneficial bacteria. Bakki Rods or Cermedia Marine Pure Spheres or Plate blocks would be perfect for your setup.

 

So more surface area for BB, and more water flow through the bio media. Maybe block off the top tub's outlet to reduce the flow down to the middle tub, so at least half the tub is submerged under water. Think of a canister filter... the media is in contact with a lot more water, for a much longer time.

 

More plants will also help with nitrates. LOL, those plastic ones you have ain't doing shyte.

Edited by jayc
Link to comment
Share on other sites

4 minutes ago, jayc said:

looking at photos 2 & 3, it seems like the water from the bottom tub doesn't flow through much of the media before exiting to the next tub down. 

What sort of bio balls do you use? Those plastic ones?

There are a much better bio media around. You need more surface area for beneficial bacteria. Bakki Rods or Cermedia Marine Pure Spheres or Plate blocks would be perfect for your setup.

So more surface area for BB, and more water flow through the bio media. Maybe block off the top tub's outlet to reduce the flow down to the middle tub, so at least half the tub is submerged under water. Think of a canister filter... the media is in contact with a lot more water, for a much longer time.

More plants will also help with nitrates. LOL, those plastic ones you have ain't doing shyte.

Hi jayc,

Thanks for the info and suggestions. I will give them a go for sure. The bio balls I currently have are those cheap plastic round ones, so I will hunt around for something a bit better with more surface area for the BB. I will also reduce the flow from the top tub so that it fills up more so the media is in contact with the water for a long period of time and submerged more.

Hahaha. Yeah..those plastic plants cost less than 50c each, so just got them for decoration and something for the crayfish to climb on. I'll get some proper water plants and add them too.

Thanks again for the help. Appreciate it.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  • Similar Content

    • Sawyer
      By Sawyer
      Ello, I'm Andrew, I mostly joined this forum out of curiosity and to ask the question about preserving my crayfish moult, but thought I'd introduce myself.
       
      I have a tank with a blue crayfish, Sawyer. He's big guy, and he's got a lot of personality. He's in the tank with four fish tank mates, all of which don't bother him at all, and are all very sweet fish. I'm not certain of the species of the fish, though, the guy that was getting rid of them didn't even know what he had in his tank. 
       
      I'll post some photos of my big guy for you all. I'd add shrimp to my tank, but there's already a nice balance where Sawyer's not eating anyone, and I don't wish to mess it up, you know? 
       
      Nice to meet you all. xx 



    • wayne6442
      By wayne6442
      Cherax quadricarinatus (Redclaw Grayfish)    Back in 1985, I started a semi commercial venture breeding Redclaw Crayfish for the commercial market. My set up consisted of four 5,000 litre above ground swimming pools, set side by side with an overflow water exchange feature, a swimming pool pump and a pool sand filter. Water pick up for filtering was regulated from each pool passed down a common pipe to the filter, and from there the water was returned to the ponds via a spray system from above. This ensured that the returning filtered water was well airated for the redclaws.     My initial stock consisted of about 400 wild caught Redclaws from Northern Queensland split roughly between the four pools. About three weeks before stocking I seeded each pool with about 10 kilos each of mud from a local dam and cow manure from a dairy farm,to set up the bio eco system that the cray's would need     This venture ran well for about three years, I was supplying my restaurant and others with live crayfish an a weekly basis.  AND THEN!!!  the government started to interfere by imposing strict live fish trading rules and introducing very expensive licensing fees. Unfortunately, The combination of both were enough to force me to close down my enterprise.  
       (Cherax Quadricarinatus)!  Redclaw Crayfish  also known as the Tropical Blue crayfish,and Australian Freshwater Crayfish.     Redclaw crayfish are a moderately large crayfish, and can reach lengths of over 90 mm and weigh in anywhere between 300 and 600 grams. They have a smooth body which is greenish/blueish in colour, the male of the species is distinguished by a bright red colouring on the margins of their large claws.     The Redclaw is native to the upper reaches of the rivers in north eastern Australia and Papua New Guinea. It's preferred habitat is in high turbidity,slow moving streams or static waterholes. Redclaw prefer sites with abundant aquatic vegetation that provides cover. Redclaw do not burrow into the riverbanks like other Cherax species but prefer to hide in natural depressions,under rocks or amongst vegetation.       Female Redclaw brood their eggs for six to ten weeks, depending on temperature. Most produce between 300 to 800 eggs per brood and they sometime breed five to six times per season. Water temperature is important  for breeding with the preferred range being 23 C to 31 C. Hatchling's resemble the adults and remain attached to the undersides of the female for several weeks before becoming independent                                                       male Redclaw
            Redclaw are NOT good aquarium tank mates, DO NOT KEEP THEM IN WITH OTHER FISH OR PLANTED TANKS. Although more placid than their other Charex cousins, they can get very agro when they have a mind to. My tip is to house them in a large aquarium 60 cm or larger with plenty of structure for hiding places so as they can get away from each other especially during times when they are moulting. The female also becomes very territorial when berried. FEEDING: They are omnivores but tend to eat more vegetable material, I have known them to munch into driftwood in their tank, they are not good fisherman being slower than  other Cherax species, but that does not exclude fresh fish from their diet. They do like chicken pellets, a very small piece of red meat , worms, and fish.
           I found that water temperature at around 25C to be good ( don't go up to 31C) good filtration with plenty of surface movement. PH between 6 and 7.5 although they can stand higher. Selective Breeding : I found the Redclaw to be relative easy contender for selective breeding ,having success in breeding a beautiful deep blue, pale blue, a deep green and an almost albino over successive generations. I also found that sometimes they will revert back to their original colours when severely stressed. I hope that this article will help some of you who are contemplating keeping Redcaw Crayfish.
       
      Male Blue                 Female White
       
      Disclaimer : The information contained in this article is purely from my own experiences and is by no means intended to be completely right in my findings Wayne Summerhayes
         
      View full article
    • wayne6442
      By wayne6442
      Cherax quadricarinatus (Redclaw Grayfish)    Back in 1985, I started a semi commercial venture breeding Redclaw Crayfish for the commercial market. My set up consisted of four 5,000 litre above ground swimming pools, set side by side with an overflow water exchange feature, a swimming pool pump and a pool sand filter. Water pick up for filtering was regulated from each pool passed down a common pipe to the filter, and from there the water was returned to the ponds via a spray system from above. This ensured that the returning filtered water was well airated for the redclaws.     My initial stock consisted of about 400 wild caught Redclaws from Northern Queensland split roughly between the four pools. About three weeks before stocking I seeded each pool with about 10 kilos each of mud from a local dam and cow manure from a dairy farm,to set up the bio eco system that the cray's would need     This venture ran well for about three years, I was supplying my restaurant and others with live crayfish an a weekly basis.  AND THEN!!!  the government started to interfere by imposing strict live fish trading rules and introducing very expensive licensing fees. Unfortunately, The combination of both were enough to force me to close down my enterprise.  
       (Cherax Quadricarinatus)!  Redclaw Crayfish  also known as the Tropical Blue crayfish,and Australian Freshwater Crayfish.     Redclaw crayfish are a moderately large crayfish, and can reach lengths of over 90 mm and weigh in anywhere between 300 and 600 grams. They have a smooth body which is greenish/blueish in colour, the male of the species is distinguished by a bright red colouring on the margins of their large claws.     The Redclaw is native to the upper reaches of the rivers in north eastern Australia and Papua New Guinea. It's preferred habitat is in high turbidity,slow moving streams or static waterholes. Redclaw prefer sites with abundant aquatic vegetation that provides cover. Redclaw do not burrow into the riverbanks like other Cherax species but prefer to hide in natural depressions,under rocks or amongst vegetation.       Female Redclaw brood their eggs for six to ten weeks, depending on temperature. Most produce between 300 to 800 eggs per brood and they sometime breed five to six times per season. Water temperature is important  for breeding with the preferred range being 23 C to 31 C. Hatchling's resemble the adults and remain attached to the undersides of the female for several weeks before becoming independent                                                       male Redclaw
            Redclaw are NOT good aquarium tank mates, DO NOT KEEP THEM IN WITH OTHER FISH OR PLANTED TANKS. Although more placid than their other Charex cousins, they can get very agro when they have a mind to. My tip is to house them in a large aquarium 60 cm or larger with plenty of structure for hiding places so as they can get away from each other especially during times when they are moulting. The female also becomes very territorial when berried. FEEDING: They are omnivores but tend to eat more vegetable material, I have known them to munch into driftwood in their tank, they are not good fisherman being slower than  other Cherax species, but that does not exclude fresh fish from their diet. They do like chicken pellets, a very small piece of red meat , worms, and fish.
           I found that water temperature at around 25C to be good ( don't go up to 31C) good filtration with plenty of surface movement. PH between 6 and 7.5 although they can stand higher. Selective Breeding : I found the Redclaw to be relative easy contender for selective breeding ,having success in breeding a beautiful deep blue, pale blue, a deep green and an almost albino over successive generations. I also found that sometimes they will revert back to their original colours when severely stressed. I hope that this article will help some of you who are contemplating keeping Redcaw Crayfish.
       
      Male Blue                 Female White
       
      Disclaimer : The information contained in this article is purely from my own experiences and is by no means intended to be completely right in my findings Wayne Summerhayes
         
    • wayne6442
      By wayne6442
      Cherax quadricarinatus (Redclaw Grayfish)    Back in 1985, I started a semi commercial venture breeding Redclaw Crayfish for the commercial market. My set up consisted of four 5,000 litre above ground swimming pools, set side by side with an overflow water exchange feature, a swimming pool pump and a pool sand filter. Water pick up for filtering was regulated from each pool passed down a common pipe to the filter, and from there the water was returned to the ponds via a spray system from above. This ensured that the returning filtered water was well airated for the redclaws.     My initial stock consisted of about 400 wild caught Redclaws from Northern Queensland split roughly between the four pools. About three weeks before stocking I seeded each pool with about 10 kilos each of mud from a local dam and cow manure from a dairy farm,to set up the bio eco system that the cray's would need     This venture ran well for about three years, I was supplying my restaurant and others with live crayfish an a weekly basis.  AND THEN!!!  the government started to interfere by imposing strict live fish trading rules and introducing very expensive licensing fees. Unfortunately, The combination of both were enough to force me to close down my enterprise.  
       (Cherax Quadricarinatus)!  Redclaw Crayfish  also known as the Tropical Blue crayfish,and Australian Freshwater Crayfish.     Redclaw crayfish are a moderately large crayfish, and can reach lengths of over 90 mm and weigh in anywhere between 300 and 600 grams. They have a smooth body which is greenish/blueish in colour, the male of the species is distinguished by a bright red colouring on the margins of their large claws.     The Redclaw is native to the upper reaches of the rivers in north eastern Australia and Papua New Guinea. It's preferred habitat is in high turbidity,slow moving streams or static waterholes. Redclaw prefer sites with abundant aquatic vegetation that provides cover. Redclaw do not burrow into the riverbanks like other Cherax species but prefer to hide in natural depressions,under rocks or amongst vegetation.       Female Redclaw brood their eggs for six to ten weeks, depending on temperature. Most produce between 300 to 800 eggs per brood and they sometime breed five to six times per season. Water temperature is important  for breeding with the preferred range being 23 C to 31 C. Hatchling's resemble the adults and remain attached to the undersides of the female for several weeks before becoming independent                                                       male Redclaw
            Redclaw are NOT good aquarium tank mates, DO NOT KEEP THEM IN WITH OTHER FISH OR PLANTED TANKS. Although more placid than their other Charex cousins, they can get very agro when they have a mind to. My tip is to house them in a large aquarium 60 cm or larger with plenty of structure for hiding places so as they can get away from each other especially during times when they are moulting. The female also becomes very territorial when berried. FEEDING: They are omnivores but tend to eat more vegetable material, I have known them to munch into driftwood in their tank, they are not good fisherman being slower than  other Cherax species, but that does not exclude fresh fish from their diet. They do like chicken pellets, a very small piece of red meat , worms, and fish.
           I found that water temperature at around 25C to be good ( don't go up to 31C) good filtration with plenty of surface movement. PH between 6 and 7.5 although they can stand higher. Selective Breeding : I found the Redclaw to be relative easy contender for selective breeding ,having success in breeding a beautiful deep blue, pale blue, a deep green and an almost albino over successive generations. I also found that sometimes they will revert back to their original colours when severely stressed. I hope that this article will help some of you who are contemplating keeping Redcaw Crayfish.
       
      Male Blue                 Female White
       
      Disclaimer : The information contained in this article is purely from my own experiences and is by no means intended to be completely right in my findings Wayne Summerhayes
    • wayne6442
      By wayne6442
      Cherax quadricarinatus (Redclaw Grayfish)    Back in 1985, I started a semi commercial venture breeding Redclaw Crayfish for the commercial market. My set up consisted of four 5,000 litre above ground swimming pools, set side by side with an overflow water exchange feature, a swimming pool pump and a pool sand filter. Water pick up for filtering was regulated from each pool passed down a common pipe to the filter, and from there the water was returned to the ponds via a spray system from above. This ensured that the returning filtered water was well airated for the redclaws.     My initial stock consisted of about 400 wild caught Redclaws from Northern Queensland split roughly between the four pools. About three weeks before stocking I seeded each pool with about 10 kilos each of mud from a local dam and cow manure from a dairy farm,to set up the bio eco system that the cray's would need     This venture ran well for about three years, I was supplying my restaurant and others with live crayfish an a weekly basis.  AND THEN!!!  the government started to interfere by imposing strict live fish trading rules and introducing very expensive licensing fees. Unfortunately, The combination of both were enough to force me to close down my enterprise.  
       (Cherax Quadricarinatus)!  Redclaw Crayfish  also known as the Tropical Blue crayfish,and Australian Freshwater Crayfish.     Redclaw crayfish are a moderately large crayfish, and can reach lengths of over 90 mm and weigh in anywhere between 300 and 600 grams. They have a smooth body which is greenish/blueish in colour, the male of the species is distinguished by a bright red colouring on the margins of their large claws.     The Redclaw is native to the upper reaches of the rivers in north eastern Australia and Papua New Guinea. It's preferred habitat is in high turbidity,slow moving streams or static waterholes. Redclaw prefer sites with abundant aquatic vegetation that provides cover. Redclaw do not burrow into the riverbanks like other Cherax species but prefer to hide in natural depressions,under rocks or amongst vegetation.       Female Redclaw brood their eggs for six to ten weeks, depending on temperature. Most produce between 300 to 800 eggs per brood and they sometime breed five to six times per season. Water temperature is important  for breeding with the preferred range being 23 C to 31 C. Hatchling's resemble the adults and remain attached to the undersides of the female for several weeks before becoming independent                                                       male Redclaw
            Redclaw are NOT good aquarium tank mates, DO NOT KEEP THEM IN WITH OTHER FISH OR PLANTED TANKS. Although more placid than their other Charex cousins, they can get very agro when they have a mind to. My tip is to house them in a large aquarium 60 cm or larger with plenty of structure for hiding places so as they can get away from each other especially during times when they are moulting. The female also becomes very territorial when berried. FEEDING: They are omnivores but tend to eat more vegetable material, I have known them to munch into driftwood in their tank, they are not good fisherman being slower than  other Cherax species, but that does not exclude fresh fish from their diet. They do like chicken pellets, a very small piece of red meat , worms, and fish.
           I found that water temperature at around 25C to be good ( don't go up to 31C) good filtration with plenty of surface movement. PH between 6 and 7.5 although they can stand higher. Selective Breeding : I found the Redclaw to be relative easy contender for selective breeding ,having success in breeding a beautiful deep blue, pale blue, a deep green and an almost albino over successive generations. I also found that sometimes they will revert back to their original colours when severely stressed. I hope that this article will help some of you who are contemplating keeping Redcaw Crayfish.
       
      Male Blue                 Female White
       
      Disclaimer : The information contained in this article is purely from my own experiences and is by no means intended to be completely right in my findings Wayne Summerhayes

×
×
  • Create New...