I noticed some of my mollies had ick. I treated with Coppersafe but, a few died anyway(3 died). There are 6 other mollies in the tank and they are all looking healthy and %26quot;ick free%26quot;. Should I do a complete water change? I am still treating the fish with the Coppersafe just to be sure no one else dies. Is that correct? I just want to save the other fish.How much of a water change when fish are dying?Unfortunately (as this would be much easier), activated carbon doesn't adsorb Coppersafe (sequestered copper sulfate).[1] The only way to remove it is with water changes or EDTA... I'd go with water changes. Don't do a single large water change, as this is entirely unnecessary. Instead, just continue your normal maintenance schedule, and allow this to dilute the Coppersafe. Even after the first water change, the levels should be low enough for the bacteria in your filter to begin the regrowing process. If you're still treating with Coppersafe, there's no need to do water changes unless you see ammonia levels appearing. If this is the case, do a 25-50% water change, and add the dose for as much Coppersafe as you remove in the water change (remove 4 gallons of water, add 5 mL).
Also, malachite green and formalin (Quick Cure and most other Ich medications)[2] are just as toxic to plants as copper sulfate (Coppersafe).How much of a water change when fish are dying?never do a complete unless you have some more water in another tank filled with bacteria so the fish won't get shocked. i would say do a 30% water change. it might clear thenHow much of a water change when fish are dying?First you need to figure out the cause of your fish dying. Take a water sample to your local pet store unless u have test kits. As far as water change, 30% is too much. 10 -15% and re-test your water.How much of a water change when fish are dying?If Copperhead comes along or Carl S and answers this, follow their advice as they'd know much better then I. I THINK that coppersafe as a med isn't something you'd need to do a 100$ change to get out. Coppersafe should really only be a danger to your plants and if you used activated carbon, that should get the med out of the water fairly well.
In the future, I think you'll get just as good results with less possible harm to plants using quick cure. I wouldn't do a complete water change, but rather successive medium sized changes in combination with using activated carbon to get the coppersafe out.
