you can do 2 you will have to do some research on a good reflectors that has a 3 foot coverage.... there out there just need to do some research.
and retro fit and a regular mh, is all about how they look. Retro kits are made to be hidden in a canopy also cheeper and "regular" one are finished on the out side so there easier on the eyes.
does this mean your aggressive tank is going to become a reef ??