I've kept several over my 30+ yrs of fishkeeping, never had any issue with them and their tankmates. If a RTS is comfortable and not stressed in that they are calm, vibrant coloured, and will be quite happy in a 29gal tank. If you have one that is zooming around and not in full colours, something is wrong and i dont mean tank size. If you have one that needs to jump out again its is not happy. Mine never attempted escape, alway in full colouration (no greying out), was calm and peaceful with tankmates. I would happily keep one in a 29gal long term. (and will be adding another to this tank soon as its replanted)