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Sketchy question, but has anyone tried hydrogen peroxide? Saw a YouTube vid where they spot-treated cyano with 3% H2O2. Scared to mess with my torch corals though.


Done it. 1mL per 10g, dripped over cyano patches with the pumps off for 15 mins. Torches were fine, but my Goniopora hated it. High ...

Had the same issue last year. What's your phosphate level? Cyano thrives when there's an imbalance between nitrate and phosphate. If it's undetectable, try dosing NeoPhos to 0.03 ppm while keeping nitrates around 5. Also, increase flow in dead zones with a cheap wavemaker.


Yep, flow's key. I ...