Is this a diatom bloom?

RedhawkReefer93

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vertigo01

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My diatoms never looked like that.
They made the sand and rock look as if it were covered by brown dust.
That looks sort of like Cyano. Although I could be wrong.

How long has the tank been cycled?
Water parameters?
 

SDReefer

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Yeah diatoms are usually brown. Looks like cyano. How old is your tank and how much flow do you have? If it's a relatively new tank, cyano is a part of the tank establishment process.
 
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