yesterday i noticed that one area of my clam is pinching. i removed it last night and did an inspection of the shell and found one pyramid looking snail on it (very small) so i removed that. i only found one. i put the clam back in the water and the mantle has extended a little more than yesterday but it's still pinched a little or what i think is pinching. i used a turkey baster and tried to blow any sand or any other debris off it's shell and under the mantle. this morning i noticed that a small long green looking bug was in the area where the mantle is pinched. should i do a freshwater dip to remove other things that could cause the mantle pinching or should i just wait a few days to see if it recovers? the clam looks good except for this one area. here is a picture of it taken just a few minutes ago. Any advice is appreciated.