Not aipts, not a parazoanthus" I use to keep those before.
This is like a combo of GSP and sympodium. Doesn't grown or spread via a matt like Z's and P's do. More like buddings like anemones would.
I nuked my tank last night, spread kalk all over the rocks that contained them and left water pumps off for 30plus min of contact, lets see what survives. hopefully NONE