My guppies had fry about a month ago and my tank was a mess. I didn't have it all decorated had plants floats and things just laying around. Then I started getting brown algae it was horrible. Finally it was time to start fresh. I did a full turn around on the tank, soaked and scrubbed everything. Fresh looks brand new got it all set up now. Well that was Wednesday after everything was redone. Last night I seen it getting a little cloudy after it was sparking clean. So I ignored it. Now it's white fuzz everywhere. What is it and is it harmful?
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