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It’s attached to the underside of the coral. And it squeezes shut in response to disturbance.Look like bristle worm
Could it be a clam? The way it opens up is kind of clammy.I was going to guess sponge but sponges don't move. Rip it off and tooth brush the Skelton just to be safe imo.
View attachment 2968964I occasionally find a scallop groing under rock and coral in my tank. it turns into another thing to deal with. Just hard to tell from the picture.
I occasionally find a scallop groing under rock and coral in my tank. it turns into another thing to deal with. Just hard to tell from the picture.
Clatharina sponge which is a poriferan type sponge and can be invasive. Remove with either a dental pic or small crochet needle.Just got this coral a couple days ago and just noticed this barnacle like thing on the side. It likes to suck in water and spit sometimes. It has a hard shell. It also has super skinny orange white arms all over it. Is this thing harmful?
View attachment 2968912
Check my video I posted a couple replies ago. It has a shell that opens and shutsClatharina sponge which is a poriferan type sponge and can be invasive. Remove with either a dental pic or small crochet needle.
Did see video previously- Looks like a tunicate also called sea squirt.
Here’s a video of it in action
Have yours ever caused any problems or do you remove them all? Because if this guy is no harm I might let him be.Your description matches and it looks very similar to bivalves found on my ocean-direct live rock. I have not identified specifics yet.
Mine almost look like part of the rock, as they are embedded in holes and cracks (not sure if they bore the spaces or just fill them).
I'll have to look into scallops to see what type might be common on rock from the Florida Gulf.
Edit: @Wrapse After a quick online search, it looks like mine (and possibly yours) may be similar to thorny oysters (see first image: thorny oyster fully open), though it looks like this pictured species is from the Indo-Pacific.
From what I can see, I'd guess either a Thorny Oyster (Spondylus sp.) or a Jewelbox Clam (family Chamidae). They're harmless filter feeders.
As a note on scallops, they have the little "tails" at the back of their shells that make them easily identified.