I use 4 X 54 Watt T5HOs with individual parabolic reflectors, on my 55Gal display. I think the only thing I'm missing by not having Halides is "shimmer". I keep a Crocea a few inches off the bottom, and it looks great. I originally used only 2 bulbs, and when I went to 4, the Coraline on the top back of the tank actually bleached. When I get around to building the canopy it will be about 8 inches tall, low profile compared to Halides. The T5s also don't impact my Temp. as much as Halides. T5HO with a small Halide for "shimmer", IMO would be best.
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