need advice

[sea gnome]

I hve disassembled my 90g tank and preparing to redo it again. I have taken out the undergravel filter and crushed coral bed [img]images/smiles/icon_eek.gif[/img] . I am now wanting a sand bed. Do you suggest dolomite or live sand or a ratio of both? I am also contemlating a sump /refuguim and wonder if its worthwhile to get the tand drilled. I also wonder if the uv sterilizer could be hooked up to the sump and where it would fit in and would a magnum 350 power canister filter drive a sump?

Thanks Rachel