Lobster Boy
welcome to the board.
its tough to provide much without knowing more about the tank, ie how many fish, lighting, protein skimmer, water source for changes, sand depth etc. all of these components play a major role in the ballance of the tank. the red film sounds like cyanobacteria which is just one of the several types of algae that usually show up for a while in new tanks. fme try to keep the current quite strong and that might help.
as for overfeeding, if you don't already have some, you might consider getting a few hermit crabs. they do a good job of cleaning up any excess food. i don't think anyone in town has em affordably so j&l (
www.jlaquatics.com) in van is the best.
shane