Welcome back to the hobby, sorry to hear about the divorce.
Diatoms and other algae will be back in full force again, so just be prepared for that. It'll be about 6 months before the tank really settles in.
Generally one-bottle calcium supplements are frowned upon, as they don't actually provide equal additions of calcium and alkalinity, which are needed to promote stony coral and calcerous algae growth. It looks like you have it, so you can go ahead and use it, but I wouldn't expect too much out of it.
If you bought it with the intent of using it to accelerate purple coralline algae growth, I wouldn't count on it to accelerate that process. There's no good way to accelerate the process, despite many claims suggesting otherwise. Painting the rocks purple is the only fast process to purpling-up the tank IMO.
Is the tank up for a week now and you're already adding corals? I hate to be debbie downer (again), but you really need to let the tank mature a bit, or you will end up losing things. I would run the tank empty for a few weeks, then with only a clean up crew for a few more weeks, probably close to a month, then after that, I'd expect the tank to look UGLY with algae and diatoms, but you could slowly start adding hardy coral and a small fish or two.
As far as the Kessil, I'd recommend starting the power level SUPER low, maybe in the 15% range, and then work up by 5% per week or so until the corals are unhappy. Blasting them out of the box could explain why your zoas are unhappy. You shouldn't really have to go more than 50% or so on the kessil to get enough light, probably max should be around 65% for your tank depth, though I'm not an expert on kessils.
Good luck, we're here to help, but my #1 recommendation at this point is to slow down and appreciate the maturation process for what it is. Only bad things happen quickly in this hobby.
