The 143 might be a little overkill, but it's better to have too much than not enough. I think I've said that before... lol! I just installed a BRS Dual GFO reactor with a Mag-Drive 3 pump. It took about 30 minutes to assemble, fill, mount it, flush it, and have it running in the fuge. I really like it.
I haven't had much luck with LED, so I went with T5 HO with timers on both tanks. I have a 48" fixture on my 125 (6' tank), and it does a great job. I have a 36" on my 40B (3' tank) and it's a little overkill, so I only run half the lights for the time being. I eventually want to put SPS in the small tank, so I know it'll have sufficient lighting. I gave $150 for the 48", and $125 for the 36". I spent nearly as much again upgrading all the cheap bulbs that came with the lamps with ATI bulbs. I have a few LPS and a couple of SPS in the big tank, and they are doing great. I mounted both lamps inside canopies, and there's no heat issue. Tanks run the same temp day and night. The back of the canopies are open, so the heat from the lamps creates air flow. Hot air rises and exits the canopy at the top, which creates lower air pressure underneath. Cool air is drawn in over the water and under the lamps by this low pressure. A fanless flow is created by simple convection. I had originally intended to install cabinet fans to remove heat, until I realized I didn't need to since it wasn't an enclosed compartment. Pretty cool, huh? LOL!