I don't remember how the 8 bulb PM was wired so I'm not sure what you have in terms of switches. When I had an 8 bulb fixture I always had a group of 4 that had 3 Blue+ with 1 Fiji Purple. I'd take the other 4 and 3 Blue+ and a GE 6500K. This is a good recipe for growth and aesthetics, but if you want more actinic pop and flourescing, swap the GE 6500k for a AS 15k. I wouldn't run just the Blue+ and FP alone, in my opinion the corals benefit from a little more of a full spectrum than that combo offers.
In regards to the GE 6500k, I am a big fan of this bulb and I used to run a GE 6500k in place of one of the Fiji Purples. When combined with the high number of Blue+ bulbs, I feel that they have a similar effect - although stand alone the FP is more red and the GE more yellow. The only difference I noticed was that FP gives a little more pop to reds/warm colors. The GE 6500k really enhances yellows, which helps pinks, reds, and greens, but doesn't 'pop'.
I'll see if I can take more pictures, but I just can't get my camera to capture the colors as accurately as they appear in person. Anybody who lives in the Chicagoland area or is visiting the area is more than welcome to come by and check out my system first hand.
