is that pinched mantle?

[daniella3d]

nothing touch it that I can see. I checked for pyramid snails and other anoyance but nothing that I could see. The only thing that I cannot control are those amphipods that are anoying it at night.

When ever I go to the bathroom at night I go check on the clams and I chase the amphipods away by blowing them off the clams. I don't know if this has anything to do with the clam condition.

Once I had a cleaner wrasse that took many bites out of the clams and it regrew everything missing piece of its mantle. Now I cannot even see any bite marks. It's like the mantle is just shriveling on that part.