I'd start with the phoenix first and then work into the T5s. You may like it w/o anything else on it. If you do decide to use T5s with it I'd go with, in order of most white to most blue:
ATI AquablueSpecial
ATI Blue Plus
or
ATI Blue Plus
KZ Fiji Purple
or
2x ATI Blue Plus
That's a pair of each bulb listed.
If the color is close, but not quite there you can get some cheap, weak Actinics just to add a little pop. Actinics could also be subbed out for any of the above pair. 4 T5s and 2 150w MH bulbs will be A LOT of light for that tank. I had to cut my Tek 6 bulb light back to 4 bulbs to keep some of my softies and LPS happy when my 40 breeder was up. I'd probably go with the phoenix pair and a pair of cheap Actinics, leaving the 2nd pair out aslong as there are 2 T5 ballasts.