what are you t5 bulb selection with the radiums? is your water really blue? does the colors really pop?
For a while, I was using 4 ATI Blue+ with the Radiums. The overall color was awfully blue, but I can't say that the water was. I'm in the process now of switching things around to see if I can improve the overall balance of color. With the Radiums and the 4 Blue+, the pop in the flourescent colors was ridiculous, some of my flourescing greens on the few LPS that I have were really sweet. Unfortunately though, reds and especially pinks didn't show their true color, and corals that were already really blue kind of seemed drowned out by putting blue light on blue tissue, which kind of made it appear darker than it was.
A couple of weeks ago, I switched one of the Blue+ out for a KZ Fiji Purple, which helped the red/pink colors and toned down the blue a little bit, but not significantly. Just this week now, I switched the Radiums out for 14k Phoenix to see how they compared. Really, the difference may only be slight. If somebody switched those bulbs on me without telling me, I probably wouldn't have noticed. They are very similar, with a slight edge in overall intensity to the Radiums.
Like I said, I'd like to try and get a more favorable balance of colors but also to improve growth. I have 25-30 frags that you probably can't even make out in the pictures that I'd like to start growing out. The growth under the Radiums hasn't been anything to write home about, but I can't necessarily attribute the growth to the ligthing as I did go through some early changes of my calcium/alkalinity scheme which my have stunted things temporarily.
Next opportunity I have will be the try some 10k Reeflux, and see how that looks with the supplemental blue from the T5s.