This is a discussion on What is this? within the Beginner Saltwater Aquariums forums, part of the Saltwater Fish and Coral Reef Tanks category; -->
After a month of the new light I have been getting alot of green on the glass and this on overflow. Heres a pic
That happens to mine and Ive had it up almost a year after tearing it down to move. All I do is reach in a scrape it with an algea scraper or razer blade. Or just throw in 1 or 2 snails and they will clean it.