I have a beta that lives all alone in a 10g tank He did have some zebra danios as tank mates, but he chased them and nipped their tails so I put them in my community tank. My beta is diligently making bubble nests daily, so I put my female beta from the community tank in with him. Big Big Mistake She was petrified and spent 2 days cowering in a corner (I think she's too old for trying new things ) He terrorised her so I returned her to the community tank where she's only just getting over her ordeal. What should I do - introduce some tank mates, or a different younger female, or leave him on his own Do betas get lonely ?