1. Perform regular water changes: Make sure to do regular partial water changes to remove the cyanobacteria. This will also help to increase water quality, reduce nitrates, and lower phosphate levels.
2. Increase water circulation: Increasing water circulation can help to break up any mats of cyanobacteria and prevent them from forming new ones.
3. Reduce light: Cyanobacteria thrive in high light conditions, so reducing the light can help to reduce the growth of cyanobacteria.
4. Clean the rocks and gravel: Make sure to clean the rocks and gravel in your tank to remove any cyanobacteria that has attached to them.
5. Add live plants: Live plants can help to compete with cyanobacteria for nutrients and reduce the amount of available nutrients for cyanobacteria to feed on.
6. Add chemical treatments: There are some chemical treatments available that can help to get rid of cyanobacteria. Be sure to research which treatments are safe for your tank before adding them.