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Cyanobacteria in Reef Tanks: Causes, Prevention, and a Simple Plan

Cyanobacteria in a reef tank

Cyano often shows up when the system is imbalanced. Improving biological competition and reducing waste buildup usually beats random quick fixes.

Common signs

  • Red or dark film on sand and rock
  • Mats that trap bubbles
  • Returns quickly after removal

Common causes

  • Detritus buildup
  • Dead spots and low flow areas
  • Nutrient imbalance and instability

A safe plan that actually works

  1. Increase flow in dead spots and siphon mats during maintenance.
  2. Clean mechanical filtration and reduce detritus traps.
  3. Support beneficial bacteria and stability for stronger competition.

Recommended product: Bacteria Pro

  • Concentrated beneficial bacteria for stability and nutrient processing
  • Helps outcompete undesirable organisms in the system
  • Useful after heavy cleaning or instability

Shop Bacteria Pro