All of the triggers pose the threat of nibbling on your stony corals and crustaceans. If well fed and well stocked with "treats" you will be fine. They wont sit and just demolish a colony, they are curious and like to "sample" around the aquaria. Though if you are looking for a show piece and have a large reef tank, I'd suggest the above ^ A pair of Crosshatch Triggers ^ They are beautiful and well tempered/mannered Hope this helps! Goodluck!