"Might" and I'll repeat, "
might " be byssal threads.....it's what clams, scallops and mussels attach themselves with to a solid object. Looks rather like stringy snot (sorry folks
).
Ah, you do realise that scallops have a poor survival rate in the home aquarium? The best advise I can give you is to make sure you target feed it with a good phytoplankton.