In addition to what everyone else has said, check the R/O water for phosphates. If it has phosphates in it, your water changes will be in vain because you will just be putting phosphates right back in after you take them out.
Also, how old are your lights? Lights lose their correct spectrum over a period of time. Cyano seem to appreciate this less than optimal spectrum. Just a thought.
HTH!
Sea of Sorrow
__________________
Rick
He who laughs last, thinks slowest.
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