Awesome tank! Nice set up!
How do you like your Powermodule fixture? I'm thinking about ordering the 4 lamp version as well. The area my coral are in is about 16" from front to back and about 18" from the sand bed to the top of the water. You think the 4 lamp hybrid would be enough?
The 4 bulb does great for me and it sounds like your dimensions are similar. Youll have a bit of PAR drop off near the front and back of the tank though.