That's a 1000 dollor question there, to keep others or not to keep others with him. Most of them just want another to show off to and others just to beable to see others. I've found they show brighter colors and keep the halfmoon finge longer because they're using the tai musales more then if theyjust floaded round and didn't show off for another betta. if you have room for nother 2.5g tank. get another betta and Yu'll see a differnts in his colors with in hour of placing the new betta close to him.