Something ate my crocea

[ChuckP]

I have had my crocea clam for almost 3 years now and the other day I looked at my tank to see him laying on his side instead of upright. When I didn't notice him righting himself after a day I went to investigate, 1/3 of his mantle was greatly damaged so I relocated him. He was still closing and reacting to light changes.

 

I moved him to a different place in the tank and the next day it appeared more of his mantle had been eaten. I do not see any snails but did notice a bristle looking worm right before I relocated him. The only recent things I have added are:

 

1x Cleaner Shrimp

1x Emerald Crab (He has been on the opposite side of the clam so I highly doubt he is involved)

1x Starry Blenny

 

Any ideas?

 

I have heard blennies can nip, but this is not nipping, this is eating.

[TheUnfocusedOne]

there are nudies or snails of some sort that blend into the mantle so you cant see them

dip him and quarantine him

[revaltion131]

I assume you have no dwarf angels?