I have a 15 gallon tank that im thinking of dividing. I already have one betta and 3 cory's in the 15 gallon. Without really thinking it through, I bought another betta withouth a real place to put hm. So for now he is in a 2 gallon tank. I really dont like the 2 gallon, as I feel it is too small and doesnt provide adequate filtration. So Im thinking of dividing the 15 gallon and having one betta along with 2 corys on each side. I know corys like to be in groups of 3 or more...but do you think having only 2corys on each side will be sufficient??