I never knew bettas could live with community fish, I thought they were too aggressive. My fish are all supposedly "community" but they are territorial and aggressive though they never inflict any damage other than the occasional nip of a tail when my ratios of males to females goes awry, usually during fungul infections when I lose many fish and do not immediately replace them. Sometimes fungul infections can last weeks, or ick can take over, so I wait at least a few days after I believe the infection or ick is gone before adding new fish. My Cory cats are beautiful, long lived fish, but I recently lost one of my small ones, so I will replace it soon. I have pre planned the planting of some mini cattails in my pond this Spring when I start the new plantings in my garden and hopefully harvest at least some of my potatoes, so maybe my Goldies will breed then. I keep mostly comets and other low cost species, as they more expensive ones are usually slower and are eaten by turtles, killed or harassed by my other fish, or die from temperature fluctuations or decreases. Anyway, I think the smaller, less expensive goldfish are actually much prettier than the massive ones with the bubble like heads. Some of my goldfish are almost two feet now, after starting out as tiny, fifteen cent feeder fish. Originally I bought a few for my turtles when I got my koi pond, but my turtles were too small to kill and eat the fish, but as they got bigger I noticed something curious. Whenever I bought goldfish, the turtles left them completely unharmed, let them share food, and swam happily with them, yet when I bought rosy minnows or mosquito fish, even mollies and platys, of the same size of the small goldfish, my turtles ate them crazily. I think when they were raised with goldfish they learned that they were not food, something I always marvel over. It always makes my day when I watch my massive, aggressive turtle that beat up my other spiny softshell, kills anything that moves and isn't my goldfish or his other turtle friend, sharing a koi pellet with a tiny hungry goldfish or swimming beside one. It is truly amazing.