I used a bag of "Myricle Mud" in my sump...
I have my doubts about the stuff, but so far (2 months), it's kept everything in perfect condition along the lines of pH and Alk according to the tests. I don't have a test for any trace elements or calcium, but my corals seem to be doing good, taking my water for a test at the LFS sometime soon, I'll let you know how it comes out.
I figured, hey, why not give it a try, if worse comes to worst, I'll just take the stuff out of my sump and replace it with normal sand and algae.
I just cut up half a clove of garlic when I defrost my food and soak my food with it. Costs $.99 for 2 whole (dunno what you call them) thigns of garlic, each thing has about 10 cloves or so on it. Seems to have helped some with my clowns lymp, can't tell for sure though.