In my personal experience my LMB first killed my shrimp goby (they were added together so there was no territory already established and were first fish in tank) within 48 hours of being added, and then it took weeks to get my LMB to eat algae tabs- wouldn't touch pellet or flake or algae sheets. Some LMB are pigs, mine almost starved to death since he ate up all of the algae in my tank in a week. This is a rather common occurance which I was not aware of until I was having problems. Many LMB starve within months in tanks under 90 gallons. He then began attacking my pygmy angel when I added her so I traded him in. I do not want to discourage you, LMB are one of my faves- wish it had worked out better.