I've kept several, from young to adult size (from 1 to 5 inch). They are shy in tanks, but do well, eat everything and had no trouble keeping them. I don't like the blue, they tend to fade in my tanks, but I've caught shy, yellow tail, black, tan, and indigo that all looked good. I used to like them and tried to keep as many as I could. The problem with them as far as I'm concerned is they eat my ornamental shrimp, and I can't have that.