Fluval Evo 13.5G First Aquarium

today start appearing circle brown dots all over sand and rock should i do something ?
 

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IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
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    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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