Brown spots all over aquarium

shecamefromtheocean

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Today I was out for a few hours, and when I returned my aquarium was covered in orangey brown spots. I've seen them in small scale on some rocks and the bubble tube before, but today they just exploded. I have a 5gal with a betta and a moss ball. It is filtered and water is regularly changed. Does anyone know what these are and what to do about them? Thank you!

*also not as important but my betta's fins will be fine one day, then super raggedy the next until they get really bad and then they get better. Not sure if they're correlated, I just assumed my betta was a tail biter.
 

smee82

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Orangey brown spots sound like diatoms but they don't appear over a few hrs.
 

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