I really think the colors look great (when they do..... I don't show photos from the times it doesn't look so good

) for three reasons:
1) MH and T5 lighting to >3 wpg. I also use a AquaMedic Planta bulb paired with 10,000k bulbs, not for the supposed benefit to the plants, but becasue it casts a very pink light which brings out phenomenal colors in the fish and plants.
2) Lots and lots of micros. I've been skimping on this a bit and it's showing. With very intense lighitng you really, really, really need to keep on top of micros and macros.
3) I try to keep nitrates on the low side. It's a dangerous game to play, but when it works, the reds and pinks really show much nicer. When I get lazy and let the nitrates dip the whole tank goes to pot. Algae goes crazy and it usually takes a month or two of careful dilligence to get it back into shape.
I love R. mac. too! Watch for my writeup about it in the January issue of TFH.