Just took some video of my new rockwork and setups. The lighting on the 75G is fantastic, I got a 48" 260W CF fixture off eBay for $100, it's got 4 tubes, two 10,000K and two Actinic, as well as moonlighting LEDs.
The other tank has a 96W CF fixture but it's just 6700K lighting, you can really see the difference. My 50/50 bulb is on order for that one, half actinic and half 10,000K. The lighting accentuates the tank much more naturally that way.