if coralife has a 250x2 setup I would go for it. with 2x150 there's always room for upgrading..and considering how deep your 90 is (assuming 24") the 250 would punch right to the sand for your clams and stuff. and in a 90g with 2x250w your limit of corals you can keep would be close to infinite.
between the 10000k and the 20000k, I found the 20000k was extremely blue and much too dark. if you like the blue look, 14000k bulbs are nice and blue. 10000k and actinics is just right for my taste. I'm a T5 actinic fan
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