My Betta tank has a Overhead filter and I was wondering if it's any good for Bettas?
I added some filter floss next to the outlet to slow down the current a little bit extra too.
By the looks of it (i could be wrong) it looks like it runs on a trickle system which means the water is not forced back into the tank but instread just "runs" back in. I can't see this being a problem for your bettas as the water movement is mainly surfaced based and so your betta can get out of the way of it. It rauns back in at just one end right - so if one of them is more upset by it then move him to the other end of the tank.
