ok, thanks! Do you think I could possibly do like 5 bettas, and 3 ottos? oh, and I decided to build a shelf with my dad. It will hold twelve 2.5g tanks. and then I have a little side table thing to put a 5 gallon for seamonkeys to feed the bettas. I was told they don't really need a filter or anything, just an air pump, so they should be pretty easy. I am soooooo exited! hope this works!