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It will come back again and again, you'll have to get used to cleaning the tank on a regular basis.
Did you know that there are fish that eat the algae ? I don't know the name of the species, but they hardly swim on the surface. All they do is swim on the bottom of the tank, and up and down the glass, to eat it. I used to call them vacuumcleaners, cause it looks like they're doing that all day long. Maybe it would help a little if you add a few of those in your fishtank.
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