dendros!! here I was trying to think of what those things are called. I kinda figured it was ,I have some black sun corals in my bio cube that I spot feed. Same thing on those, picked up some live rock from 3CC about a year ago after two months the poylps started coming out.
They look nice but I might want to trade them for some cool zoas if anyone is interested. I just need to saw that rock in half so I can keep the GSP.