That does not look right for cyanobacteria. This is what cyanobacteria looks like... http://bubblesaquarium.com/images/ho...ater_algae.htm
. Look at the top 3 pictures listed under blue green algae which cyanobacteria is often called.
Is the algae fuzzy and hard to scrape off? Is this a freshwater tank? How long are lights left on daily. When having algae issue you should only run your lights 6 hours and after that depending on the lights 8 is usually the max. What are the tanks nitrate and phosphate readings? How often are water changes done and how much is changed each time? Is the tank planted? If so do they use ferts? Do they use CO2
or liquid carbon.
I appears to be one of the odd colored black beard algaes. If it was cyanobacteria it would cover things in shiny looking sheets that would easily wipe off in sections. That algae appears to be growing on the rocks and decorations.