20 gallon tank light help - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 11 Old 05-27-2009, 01:01 PM
note that the watt rule is very basic, like the fish per gallon rule. What you really need to look for is spectrum. I have a 46 gallon with a 24 watt fixture and i can still grow medium light plants. If you get 15 watt full spectrum bulbs i think you could still grow plants fairly well.
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