My cichlid tank is suffering from an unattractive green algae. I can't scrub it off the glass by hand, or by brush. It comes off the decor from scrubbing though. The algae is a deep green, and starts off as just specs on the glass, then grows out vertically and very long. How can I rid my tank of this? I will hopefully get pictures soon. I've also used two different types of algae controllers, and neither have been effective in removing the algae. My tank is planted.