I've had my two Bettas in a divided 14gal for almost two weeks. One has attempted to build bubble nests and what not (he ends up swimming into it and spreading it apart) but I haven't gotten anything out of the other one. Given he didn't make much of one when I had him in a 1gal with water changed everyday but he tried at least.
Since being in this new take both have been more active but I'm concerned that Pepper (the one who won't attempt a bubble nest) is restless sharing a tank with Noche, my other Betta. I have tried my best to cover the divider so they won't see each other but they always find away. They do ignore each other when they get tired.
Pepper spends a lot of his time moving back and forth across the front of the glass and then swimming in circles. His tail has gotten more ragged since I moved him in too.
Is it possible that he doesn't like his new home? The filter might cause surface movement so that might be why he hasn't tried one but I had the intake reduced pretty well before this and it kept the water calm. I have a sponge over the intake now so that the outtake wouldnt reduce to a trickle.
But yeah, was wondering what the signs were if a Betta didn't like his new home.
Here are some pics of the tank.
These are a little older (like a week) so there's more anacharis along the divider and the divider is much more stable than is looks right now.