Well as my title says, I have an Idea, I want to turn my 75G tank into a reef setup. I have always thought of clams as one of the most eye catching of the sessile inverts so I thought why not try to keep them? From what I hear they can become a large, long-lived centerpiece to a nice setup. So I have the tank I have the DSB everyone preaches to have and I have 80lbs of LR. I also have a 20G sump with miracle mud and plenty of algae to make a nice ecosystem knock-off. I have a prizim skimmer which IME has worked wonderful for me. What else do I need for my tank? should I be looking into a calcium reactor or is supplemental calcium liquids sufficient? The biggest question I have is about lighting. I REALLY REALLY REALLY don't wan't to spend lots of money on metal haildes. Could I get away with just PC lighting if I keep the clam in the upper column of the tank? I guess I could try to save up for the halides but if I could get away with just a set of 4-48 inch PC lights?