Quote:
Originally Posted by Russ
B,
I think that's true. With the discus, I stopped the CO2 for a day, when I saw their initial reaction. However, the surface movement seemed to remedy it. Also, I think most of us use canister filters and it has been my experience, even before I was using CO2, that they lower O2.
-Russ
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any filter system will use some O2 as thats how the nitrifying bacteria metabolise. Canister filters, unlike a sump arrangement, will not replace any lost O2 with water exposure to the air, obviously. surface movement is really the most important thing, it doesnt have to be much either to make a massive difference.