The flower thingy you mentioned that dives back in the hole if you come near it what does it look like?? Can you post a pic?? Chances are it's a pest hitch hiker like aiptasia if it's the case best to kill em now before they over populate and they will very fast. When you buy more liverock Try to buy already cured rock or rock from a healthy system that us pest free, curing your own liverock is very easy. Cheers congrats on the new tank I'm liking the square rectangle thingy lol
