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It almost doesn't matter in your case because you intend on running the G5s alongside T5s. Do you have a preference for T5 bulbs?Form what I keep hearing it seems like most people are going to the pros. A lot of people started with the blues and switched to pros for vlog videos and pictures, but also feel longterm coral health is better with more white light.
My gut is telling me to get the pros, but I think I would enjoy either fixture.
Your T5 bulb preference may even dictate whether you should get the Pro or Blue G5s.
Although I have more faith in the G5 white LEDs than the white LEDs in other fixtures I've used, I don't like white LEDs in general because of their proclivity to burn SPS (at least with the other LED fixtures I have tried). For that reason (including that T5s are generally solid bulbs in terms of spectrum and PAR), I may be inclined (if it were me) to rely on the T5s for the lower end of the spectrum and rely on the G5s to add the higher (blue) end of the spectrum, leading me to gravitate toward the Blue fixtures in your case.
For what it's worth, pre-LED era, I liked ATI T5 bulbs and the temperature a Phoenix 14k halide produced. I am not a fan of the windex or black light look. However, given the predominance of the bluer spectrum as of late (the past couple of years in particular), I've become more appreciative of the bluer spectrum (although not so appreciative that I'm willing to run a tank with the black light look).
I'm just thinking out loud/sharing my thoughts regarding your lighting choice.
EDIT: Now I'm rambling, but thought I'd add this. I've run a G4 fixture and two Hydra 26HD. The white LEDs ransacked my SPS, given my configuration at the time. However, I was running my G5 fixture at 60% as BRS recommends, slowly acclimated to about 80% and set an absurdly slow acclimation (that's ongoing) to 100%. I think my G5 is presently at ~90% with another 100+ days left on the acclimation to 100%. Given the height of the fixture (using Ecotech's mount affixed to the tank), I would have wiped out my SPS with the other LED fixtures I've used if I ran a comparable intensity.
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