yea the fish store guy that some corals and clams can be damaged by them but not all coral. id get some softies if i get any coral, i have 4 vhos 2 white 2 blue. i was gonna get just a few more fish (2) then thats it, they try some corals after i research them, make sure that they wont be bothered by the puffer. i want my tank to be simple and calming, so i dont want to over do it.