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I am by far not an expert but I've been having similar issues. Have you tested the water you've been buying? I had an issue with a LFS here where I was skeptic of the RODI water I was buying from them and tested each batch I bought from them over the course of a month and the tds tested 245 on average. After I started using walmart's brand of water my algae problems in my 24g nano cube went away.
Also, how old are your lights? Just a thought...
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Bryan
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