I have a 2.5 gallon bow front aquarium. It has all the normal requirements of light, heat and filter. I am considering putting in a divider to split the tank and get that traditional double Betta tank. I know I'm really getting to limit on how small of a tank two Bettas can live in but space is extremely limited in dorms. Now come the issues, the filter is an in-tank Whisper 10i filter. Its capable for tanks from 2-10 gallons. I feel that pump is pretty powerful, especially since one half of the divided tank will have the pump on that side with no where to swim to the other side of the tank. So is the flow for the Betta on that side of the tank too strong? Will 2 Bettas actually just stare at each through the divider forever? Or will they just stay in their respective sides? Should i down grade and get a less powerful filter such as Whisper 3i for tanks up 3 gallon sizes?