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Cloudy Reef Tank Water: What Causes It and How to Clear It Fast

Cloudy water in a reef tank

Cloudiness is usually fine particulates or bacterial blooms. The goal is clearer water without destabilising the system.

Common signs

  • Milky or hazy water
  • Dusty particles in suspension
  • Reduced clarity after cleaning or feeding

Common causes

  • Stirred detritus
  • New sand or disturbed substrate
  • Bacterial bloom after changes

A safe plan that actually works

  1. Check mechanical filtration and replace clogged floss or socks.
  2. Avoid overcleaning everything at once.
  3. Use a reef safe flocculant to bind particles for removal by filtration.

Recommended product: Reef Floc

  • Binds fine particles to help filtration remove them
  • Improves clarity after feeding, cleaning, or changes
  • Inert formulation designed for reef use

Shop Reef Floc

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