i dont know if this has been covered yet but SEACHEM makes a product called ENTICE that is helps fishes eat like Garlic extreme by kent. any way Entice is basicly bananna extracts so i would assume if you soak your food in bananna juice and feed that food to the fish than you can feed your fish bananna's. BUT i would reccomend againsed it just because of the likelyhood of adding something othere than just pure bananna ie chemicals pesticides soaps into the tank.
FOOD FOR THOUGHT
LOL
