Hello I have about a 6 month old freshwater tank with a mild amount of white skirt tetras. The tank is not overstocked. I have a 50 gal filter etc, but I have had repeating brown algae for the last two months. My fish don't seem bothered by it. It's powder looking, wipes off with ease. I've tried reducing the amount of light in the tank, hasn't helped. I stopped feeding twice a day to once a day, still hasn't helped. Can this stuff hurt my fish in the long run? It's turned some of my ornaments pretty ugly but I don't care if it doesn't hurt my tetras. Also I have added moss balls but it hasn't helped either. I only run a 15 watt fluorescent and 3 watt blue LED, the tank is not in sunlight either. I also run slightly hard water being in upstate New York. Nothing I can do to fix that, but it's within the appropriate range for the tetras. I thought about getting some shrimp to reduce the algae but I have someone in my home with shrimp allergy. The only other thing I can think to do is increase water changes and increase filter maintenance. My main concern here is the health of the fish, not aesthetics.