I had two on a 4' tank and found it was dim. I added 4 T5 bulbs using the Aquaticlife fixture, and wow what a difference.
With the two though, after awhile of acclimating I'm starting to get growth even on low %.
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Blessed are the poor in spirit for theirs is the kingdom of heaven..
Current Tank Info: 180 Gallon, 3 G4 Radions
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