I divided one of my 10 gals. yesterday morning. I have now taken Pax out, for a couple of reasons. He was Spazzing out. He bit off part of his tail. That beautiful round veiltail. So, I took him out and put him back in his 2 gallon bin. Help! What should I do?
Well, for whatever reason he doesn't like it. He may think the divider is really weird or something. Can he see the other fish on the other side? he may have felt he was in danger. I'd keep him in his 2 gal, that's good enough, and put a different fish in the 10 div. As for his tail, I'd check for finrot, and let him heal.
Thats the way one of my vt, Miclo, was in the twice divided tank, he just wasn't happy even with all his space he would constantly be attacking his neighbor, then he would even try to jump it. And during water changing he took off almost half his long beautiful tail. I dont have room for multiple houses, just dividers so I just couldn't make him happy, I gave him away to a friend, she has him all alone in a 3 gallon and she said his tail is growing back. It really depends on your bettas personality, these fish really do like to be ALONE.
I haven't really had problems with any of my Betta in a divided tank. I didn't think there would be much of a problem.
Is the divider lined with plants so they can't see each other well? Plus, having a cave in each side helps them feel safe.