A lot depends on the species of fish. Usually it's because they are trying to get away from something, real or imagined.
Temperature could be a factor, because the fish might swim faster, or be more active.
I doubt poor water parameters are to blame, unless they are so bad that it's hurting the fish. For example, if you had a huge ammonia spike.
Last edited by DaveK; 04-16-2008 at 09:25 PM.
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