I've started having what appears to be a brown algae problem in a 5-gal tank that's about two months old and cycled. I can see a brown film starting to coat the glass, plants, and gravel. Usually, I just wipe it off, since it so easily comes off. The only inhabitant in the tank is my betta, although there used to be a golden mystery snail. I have five different species of plants in my tank, all doing well. I give them Flourish once a week along with 8 hours of full spectrum light every day. Ammonia, nitrites, and nitrates are all virtually zero, and my pH is around 7.5-ish. The tank is also aerated.
Any suggestions on help with the brown algae? Is there anything I can do to keep it from growing, or should I just go out to get a snail or other algae eater?