What is this? Should I worry

[AlexDm]

I have observed that in the past week some sort of brown spots are appearing on my sand bed and a bit on some rocks, not sure if this will become some sort of algae outbreak ? My tank has been running for a month with fish I used dry rock and cycled with bacteria.

 

[Brew12]

Looks like Diatoms to me, harmless and very common in new tanks.

 

[AlexDm]

Looks like Diatoms to me, harmless and very common in new tanks.

Is there a way to stop it or get rid of it ? Or will it go away by its self ?

 

[Brew12]

Is there a way to stop it or get rid of it ? Or will it go away by its self ?

It will normally go away on its own as long as there isn't a source of free silicates.

Using tap water can keep it from going away. Otherwise, it is very rare for it to last more than a few weeks.