Is this some thing that's happened all of a sudden or has it been a slow progression?
How old is the tank, how large, what equipment, what are your general maintenance practices, what do you dose, what media are you using if any, how many fish/what kind?
Do you live in a place with air conditioning? It was smoking hot here in Calgary for the past several days, did your tank get too hot?
It's hard to diagnose a problem based on those symptoms alone more information will help get a better picture of what's going wrong.
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