I was wondering how often do people take there glass co2 diffusers out of the tank and clean them? Cause I have had mine in the tank for almost 6 months straight and it looks better then the day I cleaned it. What do you clean yours with? Ever try epsom salt? I have not seen algae on mine since I have used it. When I add epsom salt to my tank weekly I add it right on the diffuser and I have never had to clean it since.