Filter media

[CNgo2006]

Yes decommission the tank and start fresh with new substrate is what I did. I steralised everything that was used with the tank including tank,ornaments, etc... and filter with potassium permanganate and rinsed very thoroughly. The ironic thing is the tank that was affected was my most treasured tank with over filtering, best of everything ( Murphy strikes yet again! )

Until the tank is decommissioned ensure it is isolated and anything that has been in the tank such as nets, hoses, plants, etc is not used in other tanks!

[jayc]

You might not have to throw everything out.

Boil anything you can fit into a clean pot, even substrate.

Give the tank a good scrub with vinegar, rinse and let dry in the sun a couple of days before reusing.

Oh and get some Mosura Tonic Pro for next time!

[ineke]

Thanks for that. I have a tank that has had the occasional dead shrimp maybe 1 a month and that started happening when I introduced my new yellows into my CRS tank. As the losses are very minimal i hadn't really thought about it until this thread popped up again and looking back I think maybe that is what has happened because the deaths have been various aged shrimp not just older ones. Everything else is fine WP's are perfect so won't be buying anything to put into that tank anytime soon

[hoang1912]

Thanks for many advice. There are many reason that cause shrimp dead with perfect WP, one of which is filter media (mine problem)

@Chi: For shrimp disease, your UV sterilizer and it cant control that?

[CNgo2006]

Thanks for many advice. There are many reason that cause shrimp dead with perfect WP' date=' my case is one.

@Chi: For shrimp disease, your UV sterilizer and it cant control that?[/quote']

It will definitely minimise the risk but there is no 100% guarantee...I just replaced the UV steraliser after the problem for a more trustworthy one, pity it is always after something happens that we realise we should have done it right from the start and not skimp out trying to save the $$$! Lesson learnt...

[hoang1912]

Yea, I agree. It's better to avoid rather than solve the problem :">

[jayc]

Hoang,

just curious ... any updates?

[hoang1912]

Thanks for asking.

Finnaly I just finished with my tank after 2hours =)) . Changed all active carbon to matrix so currently, my filter have matrix, purigen, ceramic ring. And setup 1 more eheim 2217 (2 days ago) with sub pro and Eheim mech.

Got Mosura product, mix powder food as my friend formula.

Currently, I am topping up RO water to reduce TDS from 180 to 150 (it increase after running new matrix media), dose 2 cap of stability and 1 BT-9 spoon.

That's all for today, let see if they get better. Will update some more soon :">

[hoang1912]

Guys, I want to ask that matrix does increase tds? Currently my tds is 190, it' s significant increase from 140-150. I try to change 10% with Ro water on last Sat and yesterday, but it' s not going down. This morning, when I test the water tds, it still 186.... >"< anyone experiment this before?

[jayc]

Seachem Matrix should be completely inert, that means it doesn't alter pH or TDS.

Are you adding Salty shrimp minerals to the RO change water?

If you are, then you need to either reduce the amount or just don't use any.

I'd suggest reducing the amount, use enough so that your change water is around 100 TDS.

Pure RO water only will alter the TDS too drastically and might shock the shrimp.

[hoang1912]

Really? It rised up after I run the new media. I am not using any shrimp salty after that.

I am trying to lower it to ~100 with pure RO water bcos I saw some shrimp's shell are very thick but it's not work properly. I decide to change 10% only every 2-3 days and using Bt-9 to prevent shrimp shock. Is it ok?

[jayc]

Do a cup test.

Add some Matrix into a cup of RO water and test for TDS increase.

[hoang1912]

Ah, why didnt I think about that test before!!!!!! Gonna let u know when it's done ;))

[hoang1912]

U're right, matrix doesnt increase tds. It's purigen, it keep buffing tds similar to substrate buffing PH, that's reason. Should I take it out? :(

I found the reason, 500ml purigen treat 2000l of water. But my tank only around 150l, instead of using 100-150ml purigen, I used 500ml =))

[Squiggle]

That's very interesting, I've never had problems with Purigen raising TDS or PH, I'll have to keep an eye on it next time I recharge it. :encouragement:

[DG17]

Im running 4 bags of Purigen in my sump 1 in each section (yes overkill but ammonia,nitrate,nitrite and phosphate are 0) which is enough for 1600l and my tanks are only 500L total and my TDS never goes above 130 and after a water change never drops below 120. Only thing that use to send my TDS up was too many red bee balls in my tanks