It sounds like mantis will not damage my corals, right? So If I go ahead with the corals and leave the little clarkii in the sump/refugium until I know what it is I think that might be my best route for now. I just hope that doesn't crash the little tank because I don't have the plumbing in yet. It would have to run with the live sand and the refugium as its only biological filter. I'm hoping water changes will satisfy the need.