The Planted Tank Forum - View Single Post - My inexpensive CFL light solution
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Old 02-21-2013, 07:51 PM   #191
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Originally Posted by wootlaws View Post
Is everyone achieving this kind of growth with no co2?

I'm running my drop checker into the yellow range. So yes, LOTS of CO2. Can't speak for others but with close to 70w over a 18" tall 40b it's definitely necessary.
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