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You want to shoot for par at the substrate, not watts/ gallon. Is there a canopy on the tank? You might be better using 2- 2 foot fixtures and 2- 3 foot fixtures for good spread and easier to find/ cheaper bulbs if you have a canopy to hide them in. The sticky on par levels can help you decide how many you think you need. Three rows will probably be fine. 40-50umol on the substrate will let you grow most anything.
 
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