Brown diatom on glass

Reef Crystals is well known for having a brown slime when first mixed, but I wouldn't expect that is what is being seen in the tank in this case, unless the salt is being mixed in the tank.
 

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!

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

    Votes: 3 4.3%
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