I used to have a divided tank for 2 Bettas. It was really good, worked well (it was custom built btw) But the only issues were that a lot of algae collected on the divider.. And once, after one of the original fish died and I got a new Betta, the new guy was a digger so he got under a corner of the divider and so they almost started fighting and I panicked and scooped him out in a small glass cup.. Lol.
ANYWAY, it works great basically aside from algae build up and possible escapes.
ANYWAY, it works great basically aside from algae build up and possible escapes.