I have had very poor luck with tankmates for them myself, though I have had only the dwarf variety. I have a regular dwarf male and he is currently alone in a 10-gal because I can't find any other fish that aren't petrified of him. Any fish I have had with him (tetras/danio types) cower and hide in the cave and plants, and do not swim about, hardly even to eat. I moved them into a tank with adult angels, and they are happy as clams!! The other one is a powder blue dwarf in a 15-gal and he actually kills his tankmates. I think they are absolutely gorgeous, like some cichlids and marine fish, but I am disappointed that they are alone in their tanks. I am tempted to return them to the store for credit, but I hate to part with them. I do hear about others keeping several gouramis together, so I know it can be done, but I think it is hit or miss, depending upon the individual.