Well I don't have a 75 mine is a 72g Bow but it's close enough that I thought I would reply. Here are a few pics of my tank.
I have a 20g Tall that is a dedicated fuge under the tank. An ASM G4X recirculating skimmer and a 55g frag tank that is plumbed into the system as well. I use LR, LS my fuge and the skimmer as my means of filtration. The tank has been up and running for 3 years now and is doing very well. Lighting: Dual 175MH (10K XMs) 220w VHO Actinics and 108W T5 Super Blues.
Hope that helps you some.