Green Hair Alage

Green hair algae, also known as GHA, is a type of filamentous algae that is commonly found in aquariums. While some algae can be beneficial for the aquarium ecosystem, excessive growth of green hair algae can be unsightly and harmful to the health of the tank's inhabitants. In this blog post, we will take a closer look at green hair algae and discuss various treatment options.

What is Green Hair Algae?

Green hair algae are long, stringy filaments that can attach themselves to surfaces such as rocks, substrate, and even plant leaves. It thrives in high nutrient environments and can quickly take over a tank if left unchecked. Green hair algae can also reduce oxygen levels and clog filters, causing harm to the aquarium inhabitants.

Causes of Green Hair Algae

Excessive levels of nitrates and phosphates are the main culprits behind green hair algae growth in the aquarium. High levels of light, particularly blue and red spectrum light, can also promote the growth of GHA. Poor water flow and low levels of carbon dioxide can also contribute to the growth of green hair algae.

Treatment Options

The first step in treating green hair algae is to identify and address the underlying causes. Regular water changes, vacuuming of the substrate, and reduction of feeding can help reduce nutrient levels. Additionally, increasing water flow and improving the circulation of the aquarium can help to reduce algae growth.

Chemical treatments such as algaecides can also be effective in controlling green hair algae. However, it is important to follow the instructions carefully and not overuse the product as this can harm the tank's inhabitants.

Biological treatments such as the use of herbivorous snails and algae-eating fish can also be effective in controlling GHA. These natural predators can consume algae and keep its growth under control.


Prevention is always better than cure when it comes to green hair algae. To prevent the growth of GHA, it is important to maintain proper water parameters and keep nutrient levels under control. Additionally, proper lighting, adequate water flow, and regular maintenance can help keep algae growth in check.

In conclusion, green hair algae can be a frustrating problem for aquarium owners. However, by addressing the underlying causes and using a combination of treatment options, it is possible to control and prevent the growth of this unsightly algae. With some patience and persistence, you can have a beautiful, healthy, and algae-free aquarium.

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