i have a betta in every tank that does not have an over hyper fish or with fry
Mine are with balas, guppies, hoplos, plecos, platies, snails, danios (lots of cover to be with these guys of course), rosey reds (i know i shouldnt keep these but when i started i knew nothing, got em, and would feel bad dumping them, had for a year or so now), giant danio, thinking about trying one with tinfoil barbs but not until i get more top cover for that tank and they learn to chill out a little (might mean getting more, oh well).
Btw all of mine do fine...