hi guys i have a problem with this and was wondering how to get rid? i have read.... Description Forms on the glass creating a dusty appearance across the glass. Sometimes so bad you can't see into the tank. Cause Low CO2. Low nutrients. Quite common on new setups. Removal Easily removed with a magnetic glass scraper or similar. Often reappears very quickly. Allow the algae to run its full cycle by leaving it well alone for 3 weeks. It may become unsightly but just bear with it. Then scrape it all off and do a large water change. Sometimes requires a second treatment to fully clear and leaving it for 4 weeks. Recommended to slightly reduce dosing during treatment. ....from jamesC's 'The planted tank' i think my co2 is fine, i might be able to dose fert regularly, but would cutting down lighting help?