so would a regular power filter be a real no-no for a planted tank? I am planning a 10 gallon planted tank for this summer and was originally going to just get one of the "hang over the edge of the tank" variety, but I understand that the water falling into the tank would make me lose CO2 faster. would the loss be significant enough where that would be a bad idea? That would be the only surface agitation I'd planned on, but I was wondering if it was still too much.