How to control Green water algae in a planted tank
May 20, 20201 min read
This form of algae is also known as "green pea" soup. The water turns into a cloudy green colour.
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+).
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 Excel (which can hurt both livestock & plants) 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.
The common 'simple fish tank' seems to conform to a standard basic setup that works. While it can indeed function, it is also ironically the hard way to maintain a thriving, algae-free tank. This is why.
While 2Hr Tanks are known for their resilience against algae, but there are still occasions where we face algae problems. We share an example of a tank that was planted prematurely- before proper cycling.
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