I've never had luck with them. The first one I had would only eat aiptasia, it cleared out the tank then died. I bought one a year or so later that was eating LRS Reef Frenzy. That one mysteriously died while in quarantine. It was eating fine, then one day i come home from work to see that it is having some sort of swim bladder issue. It died within a couple hours. I would really like to get one to take care of aiptasia, but with my prior experience, I am leary of getting another one. If you discover the secret to keeping them, I will be interested in hearing it.