Very nice job on the setup, I love the raptor 8 hood. Looking forward to seeing the progress!
The undercurrent setups do not require a lot of nutes, so be careful when mixing as you can't go by the label. Current Culture has made a nute line specifically for these systems (i've not used so not sure of the quality) it might be worth checking out. I've always ran Dutch Masters in mine and don't think I ever went over 700ppm in my solution at full bloom (it has been a while though).
I was about to transfer my seedlings into mine last week, but ended up selling the system before I got a chance to transplant. Ordered a new one today so hopefully I get it up and running by next week.