green water

How many watts per gallon? Try using less fertilizer. Do a 50% water change. You only need the light on for 8 hours a day.

Any Co2?

green water is usually due to a excess of nutrients like phosphates and lack of nitrates or potassium. Test your water and if there is no nitrates present then dose with nitrates. If nitrates are present then try dosing potassium. The additional dosing will simulate the plants to use the excess nutrients and deprive the algae.

If you want a temporary fix, you can use a UV sterilizer or diatom filter. Both will remove the algae until the next water change.