Ive got an adult onespot in my 90 gallon display. I second the comment of the biggest chicken in the tank. I'm personally terrified to put my hands in the water most the time until I see him find a hiding spot and put on his camouflage. They do get spooked real easily, and all their venomous barbs extend and they go flying around the tank like a Tasmanian devil. My hand is out of the water so fast it'll make your head spin when he gets spooked. Otherwise it's a really docile and easy to manage fish. Doesn't start fights, at all, ever, and is never picked on. Just grazes on algae all day and night, and readily wolfs down anything else I offer. They do amazing work at hair and bubble algae and can really help clean up an epidemic. I also second the comment that they're fast growers. Mine went from 2.5" or so, all the way up to a big fat 6-7" in less than 2 years