Don't be jumping in to buying things. They won't solve any issues that just take time to resolve. The only time I've ever used a carbon reactor was when a toadstool got ticked and I had to negate whatever crud it was leaching into the water. Carbon can actually throw off your other parameters. We don't use it in SW like we do in FW. (I have 4 SW and 1 FW tanks)
Read, chat, research more. Stay away from youtube- they just want clicks. People here are brilliant. There are a lot of "sticky threads"- those like that beginner article that stay at the top of the forum boards and are written by the R2R "elders" (gods, geniuses, masters... Whatever)
Take
Your
Time
Or you're going to spend an awful lot of money on dead fish and coral while you make those mistakes we all go through. (It doesn't sound like you've even hit the hair algae or dino stage, yet!)
Anthias and tangs are expensive and sensitive. I've had my tank up for 20 months and just added a tang.
SW tanks are our adult lessons in patience. You can try to rush it but the tank WILL have its way and just laugh while you dump money into it trying to force the process.
Oh, and I have an "******* tank" for those damsels and clowns that thought they were going to achieve world domination....
I learn something new on this forum every day. We are here for questions and support. Welcome!!!