Is there such a thing as TDS shock? - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 12-08-2013, 09:26 PM Thread Starter
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Is there such a thing as TDS shock?

Hey guys, Im just wondering if I do a large water change using RO water to bring down my TDS (its over 400) will that adversly affect cherry shrimp? Ive seen people saying they can do just fine with TDS that high but I would be more comfortable keeping it in the low 200s. I have a 6 gal edge. Im thinking of a 50% change, and if Im at 415 and Im adding RO with a TDS of 002 Im hoping this will result in the 200s
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post #2 of 8 (permalink) Old 12-08-2013, 09:42 PM
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What is gh and kh? Tds does not tell much unless you start with di. I would do maybe 25% waterchanges every few days using rodi remineralized to 200 to drop tds. If you take half the water out and replace with pure ro your gh/kh may end up to low. Many things can make up that 400 tds. I would also do a slow drip with the new water when doing water changes.
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post #3 of 8 (permalink) Old 12-08-2013, 09:50 PM
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Cherry shrimp.


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post #4 of 8 (permalink) Old 12-08-2013, 09:53 PM
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I did that once and a few shrimp died.
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post #5 of 8 (permalink) Old 12-09-2013, 12:23 AM
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I consider tds shock as more harmful than ph shock. Always want to take your time when lowering both.
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post #6 of 8 (permalink) Old 12-09-2013, 05:56 AM Thread Starter
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Thanks for the replies, I will not be trying a big water change. It makes sense to me that a drastic change in any parameter could be harmful, I just wanted to make sure my gut was right, because Im thinking a 50% water change at one time would lower the overall TDS more than 3 20% changes. I do use a piece of airline tubing to introduce the RO so the change is not abrupt. As for my gH/kH I have to admit I don't have a test kit yet. I came into the shrimp faster than I planned (RAOK) and I have a kit on order. I mostly want to be sure they have no problems reproducing and molting
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post #7 of 8 (permalink) Old 12-09-2013, 05:43 PM
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It's osmotic shock. When you quickly reduce the TDS in the tank water it causes water to rush into the body of the shrimp that has been acclimated to higher TDS water. It can cause cell damage, so it is not something to take lightly.

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post #8 of 8 (permalink) Old 12-09-2013, 09:27 PM Thread Starter
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Quote:
Originally Posted by Lexinverts View Post
It's osmotic shock. When you quickly reduce the TDS in the tank water it causes water to rush into the body of the shrimp that has been acclimated to higher TDS water. It can cause cell damage, so it is not something to take lightly.
That makes a lot of sense Lexinverts thanks for chiming in, I hope this thread will help someone in the future who might be thinking of a large change to drop TDS, not a good idea!

Ill be doing a 15%(~1gal) change before I go on a cruise this weekend. The last gallon wc dropped the TDS by about 60ppm, so Ill expect somewhat similar results. Currently reading 415. I will do a 15% change every 3 days until I hit the 200s, and I'll report back here with my results. If anyone sees a fatal flaw with that plan PM me!
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