Fast,
I've setup a few reactors in my time so I kind a know how they work. I just wondered why you ran that pipe down the inside middle. You could have just gone outside the reactor and save that room for more media, not to mention it would be easier. You don't show any screen at the bottom, what's going to keep the media from getting sucked in to the pump?
As for the expensive stuff, I wasn't talking about corals, those are free for me. I was talking about the regulator, solenoid, CO2 tank, PH controllermeter, circulating pump, feed pump and media.