My 1 month ofd RBTA has found a home right next to my Crocea clam. The clam has only part of its mantle, nearest to the RBTA, retracted. Rest of the mantle is fully expanded and appears OK. There does not seem to be any type of irritation on the retracted part of the mantle just pulled into the shell. Any ideas or opinions on if I should move the clam or just ride it out and see what happens?