Algae problems

[SleepyPirate]

Iv recently noticed that im getting extremly high amounts of algae build up on my tank glass, Green/brown and I dont know why all my levels are great except my phosphate is a LITTLE over 0 but it dosent explain the amount im getting. Its to the point that if I clean it its back to the same the next day. My light is set for 8 hrs day lights and 12 hrs night lights. What can I do about this besides getting a UV Sterilizer or chemicals!?

Iv been doing regular water changes about 1/8 a week sometimes 1/4 every 12 days.

I have a 6 bulb T5HO Tek Light fixture with 3 daylight 1 fiji purple and 2 actinic bulbs.