Cyano of Bergerac?

[Metatrone-oz]

Hi Guys,

 

My tank has this reddish colour that just appeared on the sand bed (wasn't there yesterday).

Could it be the beginning of a cyano problem?:

 

 

[amphipod]

A little cyanobacteria is no worry, just watch out if it grows into thick mats super quick because that could mean something died, or something else is wrong with the tank to release all the extra nutrients for the Cyanobacteria to devour.

A little red sand, even a thin film eventual forming shouldn't be any concern.