I just added a neon blue dwarf gourami to a 20 gal tank. All the fish seem to be getting along, so far, the RTS has not chased him. I know there is room for a couple of more fish but will leave it this way for awhile. I have been told that gouramis are labrynth (sp?) fish, like bettas, and was wondering if they could live in bowls (or non-filtered small tanks) like bettas? If not, why? Thanks for all the information.