Nah, he's fine. The only fish he's ever eaten was a dragon goby that one night suddenly started having major issues, and I'm pretty sure died first. In my experience, the trick is to keep them very well fed. Now the catch to that is to get them to eat what you want them to. Luckily, I've gotten mine to work with me. They get either whole beefheart, shrimp, silversides, squid, clams, oysters, scallops, so on, every other night, with shrimp pellets filling the days between (since my cichlids eat them, too, so they really just get the leftovers). No problems in about 9-10 months. Him and my smaller ornate pile on each other at all times.