Hmmm, can Bettas get depressed? Maybe for some reason he is sad about the move. Did you not say in another post that you lost one of your Bettas to the move? Harley I think it was. Did they know eachother?
I hope 1fish2fish gets him, would be nice to see this stunning boy recover. :)
Bettas - Giovanni (HM), Burly (HMPK Giant)
Cats - Drew, Tao, Jakke