Need ID Please

[Feddish]

It's Alive! I found this on my new purple sea fan when I got it and tried to pull it off well it was stuck on it really good and didnt want to break any good pieces of the fan because it was in really bad shape the way it was. Well today I got looking at it for more new growth and there is!!! and this thing closed up like a clam. It has little feelers like a clam around its mouth, but it is shaped like a harp, and there is a baby one on the other side of the sea fan. can anyone help me out with this?

[Reptoreef]

I would imagine to be a sort of filterfeeding oyster due to the nature of the sea fan. Make sure to be feeding phyto as I'm sure the fan needs it.