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I run my actinics 11am - 11pm, MH 1pm - 8pm.
IMHO cyano and light aren't that closely related. Cyano can fix atmospheric nitrogen, meaning it doesn't need NO3 in the water in order to grow, so concentrate on starving it of phosphate. You could try a phosphate reactor, a refugium full of chaeto or caulerpa or some phosphate adsorbing resin in a HOB or canister filter. I use a refugium, and it works very nicely -- NO3 and PO4 are always undetectable.
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"The cure for anything is salt water: sweat, tears, or the sea."
- Isak Dinesen
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