no shark in there. way to small of an aquarium for one of them. a puffer will eat all plants, corals, etc. what type of puffer and wrasse do you have? you cant have a trigger in there because it will kill the puffer. as for another fish, you could lok into smaller groupers such as blueline, hogfish, maybe an h. tusk, hamlets, etc. do some reasearch and look under the fo section under books, i suggest checking out some of those. hth, bo