I highly doubt the clam will be low on light. It is like 8 inches away from 52 watts of high PAR light, has direct light from a window, and plenty to eat if the phyto keeps growing.
I would prefer to stay away from flame scallops and well, I am not going to waste money on feather dusters. I have a few that grew naturally in my display tank at home, so I might try to take some of them to the dorm with me.
And as for an update on the status of things, the clam isn't clearing the water as quickly as I had expected, but it doesn't seem to be getting worse every day like it was before, so that is a step forward. Water change with water from my display tank at home on Sunday, that should not only remove a lot of phyto, but introduce fresh zooplankton to help take care of things.