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Discussion Starter · #1 ·
I have a regular 20 gal with a 2x24 T5HO fixture about 4-5 inches from the water line. That's about 2.4 wpg, but I hear that T5HO doesn't follow wpg rules.

I also have a 10 gal with a 2x18 T5HO light a few inches above the water line. Is this too much light?
 
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