For the last two months I have been keeping my Derasa clam separately in a 75G RR that I have set up to allow the two squamosa clams more room to stretch. But two weeks ago I discovered that the Derasa clam have not been opening. So I decided to take it out of the 75 and place it back into my 92.
It turns out- someone has been nipping this clam! See the hole in the middle of the clam mantle (the white circle) My suspicion is the orange or gold spotted rabbitfish. Because not only the clam, the rabbitfish has also nipped on my leather corals.