Lighting consists of 3 x 250w Iwasaki 6500k Metal Halide bulbs, as well as 4 x 6' VHO's - 3 Actinic 03's, and 1 Actinic 50/50; the VHO bulbs being powered by 2 x IceCap 430 ballasts.  There are 2 IceCap variable speed fans in the hood.  The Metal Halide lamps are under Spiderlight reflectors.  Total light wattage is 1,390 watts, or 7.72 watts per gallon.  Maximum tank depth from water surface to substrate is approximately 18". 
The First set of VHO's (2 x Actinic 03's) come on at 8:00am, second set of VHO's (1 x Actinic 03, a x Actinic 50/50) come on at 9:00am, MH's come on at 10:00am.  This cycle is reversed in the evening, with the MH's going off at 7:00pm, first set of VHO's off at 8:00pm, and send set of VHO's off at 9:00pm. 

The water we use goes through a whole-house filtration unit, and a pH neutralizer.  It then goes through a 100gpd RO/DI unit before entering the tank.  The RO/DI is plumbed directly to a float switch in the sump, so water topoff is automatic.  The output from the RO/DI is actually split three ways - one outlet goes to a float switch in the  sump, the other to the Nilsen reactor, and the other to our makeup water container. 

The  sump is in the basement, and is a 100g Rubbermaid stock tank, with various partitions and baffles to prevent the dreaded micro-bubbles.  There is a layer of aragonite in the sump, as well as approximately 150 lbs of live rock. 
The return pump is a Sequence 3500 pump, which circulates approximately 2100gph at the head height that we have. 

The protein skimmer   is a DIY creation powered by a Mag 18 pump. 

The  Calcium Reactor  is another DIY creation - our most recent project.

In the tank itself, there is approx  5" of Southdown sand, and another 1"-2" of live sand.  There is approx. 100lbs of dead/base rock, under the sand for stability, 125lbs of Marshall Island Live rock, and approx. 50lbs of Fiji live rock (from the 75g).