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I have a 10 gallon with 2 10W CFLs about 4" above the top of the tank. I just lost what I had typed because I went and logged in.:angryfire. 2 13W was too much for my tank. Eh, I'm ambivalent about the wattage you should run. The thing is, those CFLs put out a lot of light in the configuration including a 10-1/2" brooder dome aluminum reflector. I think that where you are using a lot of light, you have to have adequate ferts or the plants will stop growing and the algae will start.