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Does a skimmer remove ammonia or nitrates? I've google it a it says nitrates but I'm not sure this is correct as it also says "They remove organic waste before it has a chance to break down" but by the time organic waste has become nitrates it's already broken down...
https://www.liveaquaria.com/article/240/?aid=240
https://www.liveaquaria.com/article/240/?aid=240