Heather, for the life of me, I do not know what a "sand sifting star" is. There are many that live on the sand, and these stars are often discussed on reef central. But what species are we talking about? I ask because sea star diets vary and I'm fairly confident that such is the case for the many types which live in the sand too. It would be great if their identification can be narrowed down, even if just to family or genus.
Shanna, to keep flame scallops for three years plus is truly inspiring! Perhaps you can share a little more as to how you have been providing for them? Have you fine tuned your spot feeding technique? Have the scallops settled into a well-illuminated area of your tank or are they somewhat reclusive? I ask because, while diving, I usually see them in sheltered areas (under ledges or in caves), away from direct sunlight.
Cheers,
Bob