[pogodzib]

Yes, you can mix the bulb colors. I'm not an expert on T5 lighting, but I have seen some gorgeous tanks that use them. Having 8 bulbs over a tank gives you an opportunity to do many things that will benefit your tank in both color and growth of both your corals and coralline.

Here's what the same person recommends for a 8 bulb unit

For lamps it really depends on personal taste. I would run at least 1 3000K or UVL Aquasun.

I'd try this

Front

Blue
Super Actinic
Blue
GE 3000K
Blue
GE 6500K
Super Actinic
Blue

BTW - I'll be sending you a PM.