I had one in a 29 gallon w/ 10 gallon refugium for about 8 months until I made the mistake of getting a new yellow candy hogfish, now safely relocated to the pet store, after the old one committed suicide. The hog killed all of my shrimp ( 10 peppermint, 1 cleaner and 1 fire), 1 scooter blenny, the mandarin, and a blue gudgeon. He (mandarin)was a lot of fun to watch. Especially when the shrimp spawned which was about 2x a month. The mandarin was always fat, sassy and tons of fun to watch.