Mine are pretty good. I did start out with 4 but lost one pretty quickly. The only plants they bother are some new crypts I got. they almost tore them to pieces before I moved them. They were all the same size when I got them now they are big, medium, and small. They will eat out of my hand and anytime I'm near the tank they think they're supposed to eat. I have lost a couple of tetras during the night though and I think it was them.