I have a 3 foot long very cool and ugly gray lungfish that is so big he would eat everything. He could feed a family of 4 for a week. Good luck in keeping any lungfish with anything else. He once, when he was a baby, mistook my finger for food and clamped on and hung on until I had to get him out of the tank on my finger and throw him on the floor - it was awful and I yelled the whole time. Anyway, my finger healed and he is now huge. He would now be able take off my whole hand. BE CAREFUL!!!!(= =)