first off, thanks for the responses
ok, 75gal FOWLR, tankmates are 2 domino damsels, 1 sailfin tang, and 1 foxface rabbit. no one bothers him, except one of the damsels, and i am sure he will take care of that problem if necessary. this is a fairly new step-up (2 months), and he has been in tank 3 weeks. ammonia spike (i believe) was caused by lion beginning to eat (did not eat first 10 days). he has been eating well, and still does. lfs suggested penicilan. i tried crushing up half of a pill in some water and soaking it up with krill, but he didn't like the taste. can i treat directly in display tank? (i have no quarantine tank available) i worry about crabs, starfish, etc. any more advise??