How much light do you use for your 2.5ft tank? I've been using two 36W PL all this while but I've been constantly plagued by algae. Recently I dropped the lights to ONE 36W PL while I was getting my C02 tank refilled. And all my algae problems disappeared! Granted, growth was slower but I'm willing to live with that. Now that I've got my C02 tank back, I'm thinking of just keeping the one light and adding the C02.

How much light do you guys have over your 2.5ft tanks?

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Cheers,
Nathan