Yep they sure are big photos
. looks like cyanobacteria to me too. Your tank is still going through cycling and will for the next few months. As stated, skimming lots of wet skimmate, increase water flow and when you feed mysis or other frozen foods, rinse well so the juices aren't added to your tank. Also siphon out as much of the cyano as you can when doing water changes and have the patience to let your tank have time to mature. Good luck and keep asking questions
