Orange/Brown spots forming in new 20 gallon long tank?

CichlidKeepingDude

I am fairly new to the world of saltwater so I'm not sure if this is part of the cycle, or if I need to take action. There have been orange/brown spots forming on my dry rock and live sand, and it appear to be forming in my filter media as well. Can anybody classify what this is? Should I be worried, or is this nothing to worry about?
Pictures:

IMG_3869.jpeg
IMG_3868.jpeg
IMG_3866.jpeg
 

fish 321

I am fairly new to the world of saltwater so I'm not sure if this is part of the cycle, or if I need to take action. There have been orange/brown spots forming on my dry rock and live sand, and it appear to be forming in my filter media as well. Can anybody classify what this is? Should I be worried, or is this nothing to worry about?
Pictures:

IMG_3869.jpeg
IMG_3868.jpeg
IMG_3866.jpeg
Totaly fine, my dry rock in my new tank has that on it too its just what happens in a new saltwater tank. If you have ever seen live rock it gets its color from algae.
 
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Jesterrace

Standard Diatom (aka brown algae) bloom that comes in at the end of the cycle.
 
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