It depends on the depth of the tank. I have a 15 gallon Zoa/Mushroom tank with a single 65 watt PC light-- that's 4.33 watts per gallon. They are doing great, but that tank is only 12" deep. If for example the tank was a 15 gallon high that is 18" tall more light would be needed. The old Watts Per Gallon is useless R
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