Three across 48" makes for better coverage. Two isn't enough - especially for SPS. You will be turning them up much higher if you're leaning towards SPS. Adding 2-4 T5 tubes isn't a bad idea either. Have you seen the new AquaticLife retrofit fixture? It makes adding T5 easy. AquaticLife ain't no ATI though...
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~ Mindy
SPS fanatic.
Last edited by Myka; 10-17-2017 at 12:48 PM.
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