I have a haddoni in a 74 tall (24x24x30) and it has never gotten a fish. It's only about 14 inches right now but I keep a pair of Firefish Gobies, Flame Angel, Cardinals, 2 Possum Wrasses, Mandarine Goby, Cleaner and Fire Shrimp, a trio of clowns that refuse to host in anything.....I've had it about 2 years+ and have had other fish and never one issue (knock on wood...).