07-22-2011, 12:50 PM
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Are you sure it is algae? Or just a whitish deposit? The latter occurs always, due to the water condensing on the glass during darkness and then evaporating off during the light as it heats up; anything in the water such as minerals, dirt, particulate matter, is left on the glass. The longer it is left, the harder it will be to remove.
During the weekly water change, always remove the glass and clean it. Once you have this basically off, it is an easy matter. Every week I use a paper towel (wet, usually with the water on the glass as I do water changes soon after the tank lights are on) first to sort of "wash" it, both sides, and then dry it with a dry hand towel saved just for aquarium use. If your water is very hard (more calcium, etc), you may have to do more of a cleaning weekly. Vinegar may help if it is really bad, rinsed off well afterward, or even a scraper or razor blade. Depends on the mineral content of the water.