clam parasites

Hi! I've had this Derasa clam for about a month now and I've notice the profession of a possibly pinched mantle on one side of the clam. It is about 1.5 to 2 inches long and retracts when shade is provided/scared. Additionally my bubble tip Anenome had decided to creep over and sting the mess...

I have had a maxima clam for two days. Purchased from TSM aquatics. He seemed to acclimate well, (although he had a few pyramid snails) and looked good for 2 days. This morning he is showing some smallish irregular faded spots on his mantle. Any suggestions or advice would be appreciated He...