I agree. I've kept them before. If you can, use a feeding stick to target feed the eel. I used a wooden skewer and would put a piece of krill, squid, silverside, etc.., and hold it close to the eels face (the eyesight is really poor). Feed every 2-3 days. Mine never bothered shrimp, hermits or snails. Crabs like emeralds, sally lighfoots, porcelains, were an eventual meal. The risk to fish would be if they got too clsoe to the eel while feeding and he blindly latched on to them, but I kept juvi clowns and chromis with mine and he didn't bother them. I would, hiowever be cautious with small bottom dwelling species like gobies, jawfish, etc.. Ditto on the secure rock work. These guys can dig like badgers!