Neon Goby and Dursa Clam compatible?

[dotsfriend]

I have had a Dursa Tradicna Clam for about 9 months now and it was doing great. It is about 6" now, having grown from about 4.5 to 5 when I got it. It is showing signs similar to pinched mantle although it appears that they usually do not succumb to this disease (http://www.wetwebmedia.com/ca/volume...6_4/clams.html).

Over the months since purchase I have added fish and other invertebrates to the system but the only thing that appears to bother the clam is a particular neon goby. At one time it had almost been cut in half by the clam! Both the clam and goby seemed to be doing ok; however, recently the clam no longer fully opens and in one area the mantle is "pinched", meaning that it does not extend up to the shell or over. The rest of the mantle appears okay but colors are not as vibrant as they once were. The clam also does not open fully any longer.

I am going to try catching the goby and put it in the sump (refugium).

Has anyone seen this before and any suggestions on getting the clam back to health?