I need help!
I've just gotten a 10g and a divider to separate it so that I could house both of my betta boys in the same tank. The only thing is, they can see each other through the divider and are constantly trying to go at each other. I've put as many plants as I possibly can to try and obstruct their view of each other, but they're stubborn buggers.
Is this something that is going to be an ongoing problem? Will they be too stressed to eat properly and such? Should I break down and put them in separate tanks?
Also, my filter (a Tetra Whisper) is too strong. One of my bettas got his fins sucked into the intake and they're sort of frayed now.

I don't know what to do! I've turned the filter off for now, but I don't think that can be my ongoing solution.