mine is doing well but I feed a lot of food each day. feeding them 3 times per week is surely not enough. Feeding it once a week is a slow death sentence.
What food are you giving it? supposably they will discard any dead phyto so it's best to use DT live phyto. they require very fine particule food like 5 to 100 micron, marine snow, ultraclam, ultra seafan, ultramin, oysterfeast and rotifeast are all good food for it. They do not like yeast so any food that contain it will probably be discarded.
And they are not even scallop, they are lima clam
http://www.advancedaquarist.com/issues/july2002/toonen.htmQUOTE (Jacobnano @ Mar 20 2010, 11:50 PM)

Looks like a mussel to me.
Also flame scallops do not do well in captivity.