What is this brownish rust color stuff?

Salt in Texas

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These are not great pictures but what is the brown rust color stuff on the top of the rocks? Is it something I need to worry about? If I need to get rid of it what's the process. Thanks a ton!


15383138519288503706645009963074.jpg


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Agree with the above, normal and nothing to worry about. Most likely just diatoms.
 

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

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