Yeah I currently have 1 AI Prime 16HD on the tank, I asked around and on Facebook groups about another light and they said 1 light is fine. I'm also having a little trouble with where I should keep my wave maker and where to point it. I currently have it where I circled in red and pointed it towards that rock.
Very nice tank first of all, if it were me I would leave it where it is but place it a little higher and pointing it towards the left side of the tank instead of the rock so you don’t have much dead flow spots, you could also put it on the left side facing towards the front of the tank since you have your return nozzle on the right so that way derbis and food gets forced back into the overflow. I also think one prime might give you some shadows, I would use either another prime 16 or a single hydra 32 to make sure you can supply your corals with adequate par. If you aren’t sure what kind of par you’re currently getting you could also “rent” a par reader from BRS and just return it once you’re done since those things you don’t really need to buy and keep in storage forever for such an expensive piece of equipment