I had a 20" deep tank with PCs, and I also keep the same corals you want. What I have to say to you is: prepare te be dissapointed. At that depth your corals are gonna look pretty poopy with PC: by that I mean brown and not as good as they could look under more intense lighting. If you are set on PC, I reccomend you look into Current USA's fixtures. They seem to have way better color that coralife fixture (which I have). This is because in a hood: 1 bulb is 1/2 10,000k, 1/2 6,500k and the other is half 420nm and half 460nm. All these color temps mixed together seem to bring out more colors than coralife's simple 50/50 lamps. If you can afford it I would reccomend a quality T5 fixture from Sunlight Supply for better grown and colors at your significant depth. Whatever you end up doing, good luck.