Don't try to pull it off. Think about the age of my bulbs. Look to see if sunlight it getting to the tank. Check phosphate, nitrates. And of course water change. Also check water flow.
I believe it's 1 ml per 10 gallons I'd need to tripple check, but I did it Dailey for about 2 weeks with 0 affect with any corals, inverts, and fish. I believe it starves the algae from oxygen... There is a great post on this I'd have to google it when I get home