No, not cynobacteria, looks like hair algae. Too much light and nutrients. Do you use CO2? What type of light do you use? What type of fertilizer? You can get rid of it temporarily with hydrogen peroxide like you use to clean cuts. Get a medicine syringe and pull up 3 cc. Turn off your filter and slowly squirt the peroxide over the algae. Wait 15 minutes and then turn the filter back on. The algae will turn white or brown and slowly break up. You can do this once a day until you get it all if there is a lot. You will have to figure out what is out of balance to keep it from coming back.