Originally Posted by jsgossamer
So I have two newly set up 2.5 gallon tanks with homemade dividers in them. They both are running with tetra 3i filters on one side. Is the filter going to work through the divider or will one side just be cleaner than the other?
2.5 gallons is way too small to divide. even though some bettas thrive in a gallon of water, there's absolutely no way to adequately keep the bettas from seeing each other constantly. think of prison violence: you force aggressive people or animals into confined spaces with each other and the aggression just multiplies. you'll end up either with the stress causing your buddies' immune systems to shut down, or with one of the fish finding away through/over the divider, and in that tight of a space your tank will meet a very quick end.