The reflector
http://www.jlaquatics.com/cgi-bin/sh...ogno=pfo-prf12 will be mounted in a home made canopy, I'm sure one bulb (175 MH) will be enough, I was kinda joking about adding two although I know some folks on here would do it.
Bob for that ripple effect I'd just raise the bulb away from the surface of the water a bit, I had the 175s about 10 inches off the water in my 90 and I had tons of ripples. My 400 watt is 15 inches and it's mind boggling how much rippling I get. I think the further away (with in reason) the more the light is refracted by the surface movement. (my theory).
Doug