Push on it alittle and if it wiggles but does not come off then it is a bivalve. Threads are holding it in place. Also look for 2 siphons (one might be larger than the other) at the mantle (the blue line in the middle).
its a bivalve! they usually take up residence in high feeding or high flow areas where food is carried to them, so if you are blowing phyto on your zoas and they are in your tank then thats where they are going to settle! they dont hurt anything!!!
If I'm not mistaken, it's a type of scallop. Ridged laterally, fixed at the very back, if it has little eye stalks, (could be very tiny), we have a scallop. Feed it well, and it'll be eating size in about 20 years. J/K
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