It comes with a Danner Magdrive 18. I will drain it to a bucket like I am now. I wasn't sure about the injector but felt It might be something to do in the future.You will love the life reef skimmer. It was one of the few pieces of equipment that I kept when I sold everything off a few years ago. I also switched from a RO skimmer when I had bought the life reef.
I am not running the ozone kit, but did upgrade to the larger collection cup and went with the maezzi injector for it. It is an absolute beast that you can tune any way you want.
What pump do you plan on driving it with??
I am pretty good with DIY stuff.