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Old 10-16-2005, 09:33 PM   #1
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What is causing this...Please Help

This is the second time this happened. I have a 75gal FOWLR I did a 20 gal water change on Friday morning. I mixed the salt on the RODI water for 3 days. After the water change the fish started to have rapid gill movement and then by the morning 3 died. This happened about 5mths ago. Could it be the salt? I have no idea on what to do. I still have 3 fish left, seems there rapid gill movement has slowed down. Any ideas at all?

Thanks for any help
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Old 10-16-2005, 11:29 PM   #2
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hmmm i wouldnt change that much water at the same time, i usually do maybe 10g
worth. I also have a 75 gallon. Is the temp of the water the same as the tank? What about the Sg?
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Old 10-17-2005, 01:28 AM   #3
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Thats a big change. What are your water parameter? Both before and after the change.
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Old 10-17-2005, 01:39 AM   #4
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A 20 gal water change in a 75 gal isn't really that much. It's only a little over a quarter of the volume. I have done much larger water changes in times of need with no troubles. Usually when I add that much new water though I do over a period of a couple hours to allow the fish time to adapt to the new water.
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Old 10-17-2005, 04:39 PM   #5
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There might have been a rapid change of PH involved. I don't think you could say definitively without testing the water. A rapid change in PH, temp and SG could all cause these problems IMHO.
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