11-29-2009, 07:44 PM
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Still don't know the specific chemicals, but I have to sign off shortly so will provide some advice from what there is here before I leave for the night.
I agree the tank was not cycled fully, and I believe cleaning the filter killed off the nitrification bacteria causing a mini-cycle of sorts.
Never use clarifiers to clear a cloudy tank. There are several causes for cloudiness, most are harmless to fish; only if it is toxic (ammonia or something) is it harmful. The chemicals "clear" the water by binding together particles so the filter can remove them. But the binding action also occurs in the fish's gills, which will certainly cause stress (I speak from experience, years ago I used one of these and learned my mistake) at the very least. Stress leads to health issues, increased susceptibility to disease and parasites... and the list goes on. Never, never use chemicals like these, please. I would do a 50% partial water change now to dilute them if you have used them today since the last pwc.
Cloudiness due to improper washing of gravel, carbon, etc is not harmful to the fish. Let it clear itself.
I also agree the fish deaths were due to the nitrification cycle, and the cloudiness is probably not related to this.
Monitor ammonia and nitrite, and do daily pwc to keep the levels low.