what cn i put with my multies that will take care of my algae problems? i occationally have green algae but i have terrible brown algae and it refuses to go away. i tried uping the light bcuz i read that brown algae thrives in low light and it hates high lighting so i amped up the light and it is still growing. and very fast. i want to scrape it off but when i do it kills my water quality.