Every tank gets film algae, though some more than others. Right now I have no snails in my 90g so I'm doing all the work, and I'm using the MagFloat about every 48h. I find that cleaning the glass after lights-out seems to help - the algae ends up suspended in the water column and is either eaten or (more likely) gets trapped in the filter sock overnight. It seems like scraping while the lights are on isn't nearly as effective, almost as though it's more inclined to stick to the glass while it's able to photosynthesize and multiply... or I could be imagining things
