It looks like possibly cyano to me. A good way to tell would be to try to blast it off with a turkey blaster or similar. If it is it will blow away easily in a stringy mat
blow gently with a turkey baster as it is either cyano with air pocket or macroalgae. Turket baster will dissole the cyano while macroalgae will remain
Welcome! Glad you joined. You already have some great suggestions on here. I'd always defer to Vetteguy so look at post #12 closely at his answer here in your thread.
Have you considered starting your build thread? I found its a great place to document my tank's evolution for myself. I started tank first then joined, so I'm still finding myself going back collecting pictures & updating historically as well as current state. Once you create your first post in your thread and link it to your account, they will give you build badge (look left, under my ID)
Looking for some locals to share frags and info with? This is the place! Find a local club that meets in your area! If you want to add your club just contact us.
www.reef2reef.com
This is a good reference book type online article I still review:
This article was sponsored by @MarineDepot at www.marinedepot.com. Introduction The marine environment is one of the most complex systems on the planet. The aquarium you are about to set up is only a tiny sliver of the vast ocean, but it is no...