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As stated above, water aggregation/flow at the surface fixes it. It also called biofilm and can have an oil slick look to it at certain angles/lighting
Small snails like bladder, pond, and ramshorns work fine in a 1g (you can also use Malaysian trumpet snails (mts) is sand based substrate is in). I would NOT put in mystery, apple, or nerite snails though (they get too big and poop way to much for that size tank). I've watched my small pond, bladder, and ramshorns crawl along the surface upside down eating the biofilam and leaving a small trail behind them where they cut through it, its very cool to see.
 
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