Everytime I do a water change in my 65 gal. tank for the next few days after my fish seem to want to stay up at the surface, as if they need oxygen. My #'s are all at good levels when I check. I have a glass top covering the tank. My husband things I fill it too high and they aren't getting enough oxygen. I have a canister filter. I fill the tank up to about 1/4 - 1/8 inch from the top. Am I filling it too full and are they trying to get oxygen?
Thaks for any input.
Jill S.
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