Welcome to R2RHey Everyone --
Just wanted to say hi. It's been years since I've setup a reef tank, and I tend not to count my 20 gal cube since it's super simple setup with only mushrooms in it (my 14 year old pajama cardinal died a while ago super sad).
I just recently bought a 150 gal SCA tank and am in the process of setting this up. I have an Apex on my 20 gal, so that will definitely transfer over. My initial thoughts are to use Halides since the LEDs cost so much over the years given their lifespans or a combination of the two for a mixed reef (RedSea 160s). The biggest thing I want to do is NOT use powerheads that stick onto the sides of the tank. I want to use a large closed loop system but I've not found much info on folks doing that so I may abandon that plan.. I will probably be talked into using Tunze, or something, but the costs are so high for that, I'd rather spend the money on corals.
Hopefully in the next 2 months, I'll have the tank setup, but the many options on controllers, monitors, and dosing seems to have grown. This is the fun part though, so I'm excited!