I just tried different combos and this worked the best for growth of the macro in my fuge. I tried on all the time, and then on and off with the main tank lights. I read on here that if you put them opposite tank lights it helps with the ph in the tank.
I turn mine on in the morning, and off at night when the main display lights come on around 6pm. I live in the desert so I run a reverse lighting cycle for heat reasons.
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