The Planted Tank Forum - View Single Post - Please help me choose right Flood light for 20 gal tall tank
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post #4 of (permalink) Old 01-11-2017, 04:41 PM
Algae Grower
kalan850's Avatar
Join Date: Aug 2012
Location: Fort Walton Beach FL
Posts: 124
I think you should go with the 2 20w. If things seem out of balance run the lights for less time. Continue to reduce or increase the light cycle until you find a balance. You can also use light diffusers or mount the lights using a system that allows you to raise or lower the lights to increase or decrease brightness.

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