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You can also use the newspaper/paper towel trick as well to remove it: Gently lay a piece of paper towel onto the top of the tank, and it will suck up all of the biofilm it comes in contact with. You then remove it and toss it.

You can also scoop the biofilm out with something like a cup when doing water changes. I get this problem a lot in my marine tanks that don't run foam fractionators (protein skimmers), and all you have to do is just siphon it out which usually reduces the biofilm to manageable proportions until the next water change rolls around.
 
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