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OzShrimp

TDS adjustment (lowering) Reassure me!

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OzShrimp

Just did my weekly water change and my tds was 175ish howeer its normally kept around 155. So anyway i ended up putting in like 30 litres of straight RO Water and brought it down to about 160 but i couldnt remember if this was all good to do lol.

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My shrimp are pretty harder and all my water changes are done by just pouring the bucket in and dont have issues but wth RO water straight need some reassurance lol, would hate to see like 100+ CRS die -nervous laugh- lol 

 

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Squiggle

Should be fine dude, just like ripping a bandaid off quick, little bit of stress but only for a short time. :thumbsu:

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ineke

That's how I drop mine too although if for some reason -lots of evaporation etc - the TDS needs to be dropped a lot I will put a small amount of Salty shrimp in the new water just so it isn't too much of a difference and you see how well my CRS tank does on it. Generally though it's just straight RO done with a slow pour from the bucket -my shrimp don't get the drip treatment for water changes!

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larrymull

Hi Guys,

My TDS has crept up to 230 with a gh of 8 in a 60l tank. Do you think I should just do a large water change and try and bring down to say 170 with plain RO water?

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al4n

I would be doing that slowly only because its a fairly large drop. Some might say it will be fine but to be on a safer side i would be doing it gradually.

I would be doing that slowly only because its a fairly large drop. Some might say it will be fine but to be on a safer side i would be doing it gradually.

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Disciple

Hello @larrymull,

All my tanks TDS were a lot higher then I usually keep them when I got back from my Holiday. When this occurs I don't got for a plain RO water change but I add half the amount of SS I usually do.

For example I keep my tiger tank at 180 so I will mix my RO water up to 90 TDS. I will usually change between 10-15% each week until the TDS is back to where I want it. Once it is back to normal I just do my usual water changes.

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  • Posts

    • CurleyJones321
      excuse me for interjecting, i apreciate you people most certainly have more experiance than me with shrimp keeping but i've just regailed myself with this whole thread and thought id through in my 2 cents.

      Crystal red shrimp prefer a TDS range of between 100 & 150. I've Obviously had problems that ive now pretty much solved where i was trying to lower TDS But now that i have got things stabilising i am playing around with raising TDS and here is how i see it... only ever do between 10 & 20% water changes at a time but this can be done twice a day. with you large tank a dripper may not be appropriate but you should also make sure you are temperature adjusting your water before you add it and only ever try to adjust TDS by 10% higher than it was at a time (i know i had a to do it this way before i got my dripper). FYI Crystal reds prefer a range of temperature between 21 & 26C (61 & 79F). I also my experience so far is that GH & KH aren't that important but your dGH of 6 is on the high end of acceptable for Crystal Red's.

      there is also 2 piece's of information you seem to be failing to provide and that is Nitrite (N02) &  Nitrate (N03) which are apart of the ammonia (NH4) cycle but all tough i have read quite high numbers for these i have never read any ammonia readings. Shrimp are VERY sensitive to N02 & N03 and from my research for Crystal Red shrimp Nitrate should not be above 5PPM and Nitrite should be at 0 but if my tolerance range for my Red Cherry Shrimp is anything to go by and that is a maximum of 20PPM Nitrate you should not have any reading above 0.05PPM. i think high readings of these Chemicals are what could be killing your shrimp and your not aware of it because your only reading Ammonia GH and TDS.

      Sorry if that comes across as over bearing but thats my opinion and im trying to help :)

      Kind regards
      James
    • CurleyJones321
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      Large (New) Tank
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      Temp - 26C
      PH - 6.5
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      dKH - 1
      dGH - 5

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    • sdlTBfanUK
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    • sdlTBfanUK
      I would think that is possible as that is pretty much the upper limit I think, and of coarse how accurate is the thermometer - I have 4 different methods and all produce different readings so it may have been a bit higher??? Mould isn't usually a problem other than it looks horrid and usually will just disappear after a tank is properly run in and as far as I know not harmful to shrimps. I have had it in most of my tanks at the start, usually on wood or something similar and either removed the item it grows on or just leave it and it gradually disappears within a month (usually less). I hope you manage to get the temperature back to normal and it sounds like you have mastered the TDS. I'm not sure where you are based, is it somewhere hot (I apologise if you have said and I have forgotten)? Simon
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