I've had my boys in this 10 gal setup. (I'm adding more plants soon.) It's the classic plastic canvas & report binder covers. The guys can see each other, but not too well, so we just have a curiosity flare now & then.
BUT- I can't figure out a filter system that will work w/ a divider in place. My 1st filter could intake on the left & output on the other: this has the effect of giving Jack too much current on his side, and Butch gets a film on his side.
I bought a sponge filter that I can aim the outtake across the divider. BUT it's just a sponge filter. The Fluval I got originally had an outake that can't be baffled (tried the water bottle trick & several DIYs, no good.
Maybe a small filter on each side?
The issue is the divider interferes with the hanging filter.
Is there a DIY workaround? I'm sick of tossing $30 filters!
Note that I have the divider as high as possible- bettas do jump!