There is a situation you have that I would like to predict. You see, Flame Scallops take about 4 - 6 months to starve in an aquarium. We just do not have enough of the correct food to feed them. Don't worry, they have no brain and they are not endangered or anything, just enjoy it while you have it
But... in 4 - 6 months you're going to find an empty shell with a really fat bristle worm (or 12) in it. These worms did NOT kill your File Clam, they were just cleaning up the Clam AFTER it died. Bristle Worms usually get blamed for killing the Clam but in fact, they saved the rest of the tank from a rotting dead clam.
Guy