Cyanobacteria (cyano)
Bacterial red / black slime that sheets across surfaces.
Bacteria, not algae. Releases bubbles when stirred. Loves low flow. Treatment: increase flow, reduce nutrients, last resort Chemiclean.
Recommended
Affiliate linksChemiclean for severe outbreaks. Phosphate checker for the root-cause work.
Boyd Chemiclean (cyanobacteria treatment)Erythromycin-derived. Kills cyano in 3–5 days.View on Amazon →Hanna Marine Phosphate ULR Checker (HI774)Phosphate as PO₄ in ppm, 0.00–0.90 range. The everyday reef phosphate checker.View on Amazon →
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