The top one is listed on liveaquaria under the divers den and is listed as a ''with caution'' species, in regards to reef safety. I think corals would be safe, but small shrimp and possibly small worms and brittlestars could become food for the fish. I would say both specimens are equal in regards to safety in the reef aquarium. I have the bottom species slotted to go into my 150g reef, when it is set up, fwiw.