In my personal experience, Bettas CAN (but don't always) get along with platies, danios, corydora catfish, plecostomus, threadfin rainbows, endlers livebearers, mollys, and sometimes dwarf gouramis!! I wouldn't recommend the gourami thing though, even though I successfully housed a betta with 2 in the past (no problems whatsoever), my most recent betta was almost killed by my dwarf gourami and I had to separate them. Also, my crowntail was the most aggressive of all the bettas I have ever owned, so I would be careful with just about anything with a crowntail. I probably would stick to bottom dwellers and a snail.
Last edited by smellsfishie; 04-14-2011 at 01:05 PM.