Nice set up - very nice. For what it's worth -
I'd move the power supply as far from the water as possible, were it is currently located it may become a Lime Magnet even with the sump lid.
Cleaner wrasses and dragnets both eat large amounts of pods, I've tried this and the wrasse starved out the dragonet in a tank twice your size. I still have the wrasse but no visibal sign of pods, they used to be everywhere.
At one time in my 210 I had as many fish as your planning plus corals, it didn't work out so well for the corals. I had a hell of a time trying to keep nitrates at 20ppm usually at weeks end it was pushing 40ppm - needless to say with nitrate that high phosphates were very hard to control. I was gettin' 2-3 ppm of PO4 from the tank with ro/di water. Po4 higher than .05 and corals doesn't work out so well for the corals.
You could get away with a smaller less expensive reactor than two lil' fishes Phosban reactor. It's a large tube and tops @ 100 gal you'll use 1 cup of GFO.
Lastly - If your cycling the tank turn off the skimmer, you want the dissolved solids to decomp and fuel the nitrogen cycle.