I had a 90 Standard 48Lx24H and the coralife 2x175 with the two NO actinics did an excellent job of lighting the tank. If the 2x150s are DE HQI units? Then that's a nice set up. You can keep some really nice clams but crocea and maxima may like the 250 better than the 150. I had a derasa in the sand under the 175s and it grew nicely, my maxima was up half way on the rock and it did pretty well but kept letting go, I moved it to 1/4 the height off the bottom and it attatched and stayed there and grew nicely.
The 250s would let you grow alot more stuff, the 150s would do your softies really nice. All depends on what you want to do in the future. As for colour I have a 14000k 250w HQI DE and it's plenty blue, I had 10,000ks on the 90 and with the actinic I had what I thought was a nice white light.
Doug
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