Ok found this growing in a few places I think it's a sponge but seems too be encrusting ..its growing around and on a couple of corals
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Ok thanks @KJ :D
;)Ok thanks @KJ :D
It's hard and encrusting..I had too break a couple of frags free from it, it's already grown up and overAgree, that looks like a sponge. The growing on coral does give me some pause. Take a turkey baster and blow on it. If it's a sponge it should not be easily displaced. If it comes apart and dislodges it could be a bacterial growth.