I am debating on whether I can add a betta to my 29gal aquarium. It is currently housing 1 angelfish, 1 pleco, 2 paradise gouramis and 3 freshwater crabs. Note that all of these fish are currently fairly small(pleco being the largest at around 4" long) and that the pleco will be removed once it gets too large. Would one male betta be ok? Feel free to suggest other fish that could add more coloration to my tank.