I have 2 LMB that are about a year and a half old.. one is about 15 inches the other is about 12 inches.. they do not get along and have become a pain in my arse! im trying to find them homes now.. they are very interactive with there keepers but not always with other fish. and they will eat whatever you can feed them and however much.. I dump a few dozen crappie minnows from the bait shop in the tank and there gone by morning.. cool fish but they eat non stop and poop the same. you need to have a special liking of these fish to keep them I think.