Why Is My Reef Tank Green?
A green reef tank is usually caused by algae or excess nutrients. It is a common beginner problem and usually points to an imbalance in lighting, feeding, flow, or water quality.
Most Common Causes
- Overfeeding
- Weak water flow
- Lights on too long
- Poor water quality
- New tank instability
👉 Testing guide: Reef Tank Water Testing Guide
How to Fix It
- Reduce feeding
- Shorten lighting period
- Increase water flow
- Do water changes
- Remove algae manually
👉 Related: How to Do Water Changes in a Reef Tank