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How to control Green water algae in a planted tank

May 20, 2020 1 min read

This form of algae is also known as "green pea" soup. The water turns into a cloudy green colour.

Common Cause

The primary cause is excess ammonia coupled with strong light for extended periods. This may occur particularly in new tanks / planted tanks that are not biologically mature. It often results from over-feeding, high levels of livestock waste and/or plant decomposition. It is more common in very warm tanks (80f+).

Solutions

Some mild cases disappear on their own as the tank matures
Immediately lower light intensity (by increasing the distance of the light source from the tank or adding shades) and reduce lighting-period to 5 hours until problem disappears
Mild cases can be cured by over-dosing APT Fix(with care) or by using Purigen as filtration media
4 - 5 day blackout for serious cases
Use Diatom filters
UV steriliser is a 100% cure for serious cases

For detailed steps on how to cycle a tank, click here.

Green Water Algae

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How to control Green water algae in a planted tank

Common Cause