its all over the new Lr i got. hasn't grown too quick either so not worried yet.
Just want to add its a bubble type like a blasto (from the shape and composition) but has some sort of foot. Dunno if i can see a skeleton or not inside. Don't want to touch it. Curious if anyone knew what exactly but the bleached look doesn't help with ID. nor does the bad pic.
juvenile fungia I have one on my rock too grew from what appeared to be just a 1/8 inch wide skeleton into what is now almost the size of a 50cent piece