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Help green algae


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This is cyanobacteria. Test your water to see what the params are at. Generally, cyano builds up where there is high levels of organic material where there is the lease amount of flow. Increasing flow in the tank, especially across the substrate surface (not enough to stir it up, but still having circulation) will stop this from happening. For now, gravel vac and you should be able to tackle this early. 

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I have the same thing happening in my Betta tank where the water flow was reduced and water lettuce was floating at the surface soaking up all the light. I did a water change/ gravel vac to remove as much as I could, and then treated the tank with Erythromycin (One dose of 200mg/10G) and will do a water change in a week. So far, I'm not seeing any new growing.

I also removed my water lettuce to keep the flow up and increased bubble in the tank. Both should increase circulation and distribute light to the other plants. 

https://www.aquariumcoop.com/blogs/aquarium/blue-green-algae

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