Not to brag or anything, but because you asked about feeding them.... I have over 30 lungfishes, and yes, it's a lot of work. BUT the great thing is I currently live on a college campus, and get all kinds of meats from the cafeteria under my meal plan, so I am always bringing them all kinds of goodies to munch on without taking a penny out of my pocket. In addition they get dog food, cat food, fish pellets, and the like. The beauty of these guys is that very little is wasted. Just give them a chunk, and you know that chunk will be eaten, not broken up into many little pieces that need to be cleaned up after. It's the poop that's altogether a different story, though!!! Major poo!
The sizes range from 3 inches to over 2 feet long. The guy in my avatar is my biggest. His yawn tells me that he could in fact inhale a kid's hand whole... scary thought, that. Tell me about yours!