Why Are My Corals Not Opening?

Why Are My Corals Not Opening?

Corals that stay closed are usually reacting to stress. The problem is often related to lighting, flow, water quality, or recent changes in the tank.

Quick Answer: Corals often stay closed because of unstable conditions, poor flow, lighting stress, or water quality problems.👉 Water quality: Reef Tank Water Testing Guide

Common Causes

  • Lighting changes
  • Too much or too little flow
  • Recent handling or moving
  • Water quality issues
  • Tank immaturity

👉 Lighting help: Reef Tank Lighting Guide for Beginners

👉 Flow help: Water Flow in Reef Aquariums

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