I found deep red really adds "depth" to the color of the tank. It makes the corals stand out from the rock, as well as enhancing some of the coral colors (not necessarily red, strangely).
I just added 4 more deep red for a total of 10 at 450mA 2 weeks ago and I really like the look... I think I'm done now. It remains to be seen if I get algae growth with that much red.
BTW with no optics I get no disco that I can tell.
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