As long as the return from the filter is causing some surface agitation/movement you should be fine as far as gas exchanges go, these are responsible for maintaining oxygen levels in the water. The height of the waterline doesn't really matter, it's more important the positioning of the return from the filter.
Can you tell us more about your water changes and products used? For example how much you change each time and which product you use. Some water conditioners do deplete oxygen in the tank when used, but should be back to normal overnight. Could also be from other elements in your tap water that are not being removed... Knowing more about this will help us get a better idea.
Giancarlo Podio
--- In tropicalfishclub@yahoogroups.com, J Wilhelm-Sweeten <shobxrs2@...> wrote:
>
> 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.
>
> [Non-text portions of this message have been removed]
>
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