so my dad came through in a big way... he did a little spring cleaning and gave me two 150 watt MH lights with their own ballasts, and this dirty old sump he had sitting in his shed with some other stuff he had gotten from walmart when they stopped carrying fish. turns out, it was the entire filtration system for walmarts fish wall... i've got a iwaki (sp) pump that is rated at 25.6 gallons a minute (slightly more than 1500 an hour), the biggest biowheel I've ever seen by marineland built into the sump with some trays for media, a huge U.V. sterilizer, and a 1000 watt heater... the plumbing is all in tact and in great shape and with a few cuts and slight modifications my plumbing will perfectly fit into the new filtration, I plan on moving my skimmer into the sump, I think it's a coralife 210 super skimmer. I need a little guidance though, the 2 trays under the bio wheel are obviously for carbon or ammo chips but would I be better off with more bio media or some mixure, and can I fill the rest of my sump with live rock if I have no light on it?