I use 2 20 watts over my frag tank (10 Gal. half full), and I am able to keep SPS frags, they don't grow upwards much, but they uncrust downwards quickly. I find many Zoo types prefer this type of lighting when well fed. Everything looks pretty good under them too, comparable to my T5 HOs, not quite as much blue. Oh yeah, almost forgot to mention my Pulsing Hand grows like wildfire under those bulbs too.
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