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ProblemsGreen Water Algae Bloom

algae

Green Water Algae Bloom

Water turns bright green from suspended single-celled algae.

Symptoms

Water is green and pea-soup like
Green color returns quickly after water change
Glass looks clean but water is colored

Common Causes

Excess light (sunlight or long photoperiod)
Nutrient imbalance with high phosphate
Low competition from plants
Overfeeding

What to Check

Light duration and intensity
Phosphate and nitrate readings
Live plant health and coverage
Direct sunlight exposure

What Not to Do

Do not rely on water changes alone
Do not blackout the tank for days without oxygen management
Do not use UV sterilizer without addressing the cause

Recommended

How Often Should You Change Aquarium Water?The Nitrogen Cycle: The Foundation of Every Aquarium Tool: Lighting Duration & Intensity Guide

This guide is informational and does not replace professional veterinary advice. If fish are severely ill, consult a veterinarian.