I see a lot of members say that they can't load or play a video directly from R2R. In my experience, it just takes awhile for the video to become 'available', for lack of a technical term.
Best of luck with your new tank!
I do have some concerns about your cycle. How have you been testing your ammonia and nitrate? Are you using *decent* test kits made for testing aquarium water, and not for like swimming pools?
I keep freshwater tanks too, I have for decades, and I too use SeaChem Prime in my freshwater tanks from time to time. However, Prime is generally not recommended here on R2R for use in saltwater tanks, and is considered counter-effective during the initial ammonia cycle. You need a small amount of ammonia present to build a population of beneficial bacteria, and the Prime is effectively binding up the ammonia, which makes it unavailable for the microbes that you're trying to cultivate during your cycle.
Also, just about all of the products that say that they add beneficial, nitrifying bacteria, such as SeaChem Stability, are largely considered "snake oil" by a lot of reefers here, meaning they basically don't work and are unnecessary. I disagree, I like and use bottled bacteria products, but I'd suggest trying Dr. Tim's One and Only or Fritz TurboStart 700, or if you can find it, BioSpira. These are the products that I believe most reefers here on R2R trust to cycle tanks.
If you're coming from freshwater, like most of us, just know that there is a larger learning curve with saltwater, and processes generally take longer to complete in your tank.
I hope that helps! Best of luck with your new tank!