Yes, right now you're in what we call the "Ugly Phase" Probably about 90-95% of new tank setups go through it and honestly every setup I've had has gone through it lol. It appears that you have Cyano Bacteria in your system right now. I always use ChemiClean for my Cyano outbreaks and it has worked wonders within 48 hours of treatment for my tanks every time. Just ensure you turn off any protein skimmers and remove any Chemipure and carbon from your filtration before dosing! then after 48 hours (Sometimes I stretch it out to 72 hours for a full effect) perform a 20% water change. And for the ugly phase that you're in, just continue being consistent as you are now and I promise you will notice improvement in your display tank by the 8-9 month mark.
Speaking of ChemiClean, I just dosed my 10-gallon column bedside reef tank with it literally 30 minutes ago. Probably why I sounded like I read the box lol

but Cyano can pop up from time to time. ChemiClean in my experience just makes it disappear completely every time.