I spoke with Sanjay for a few moments after his talk and he too recommends the parallel PFOs. I forget the name of the last reflector he tested (the large diamond shaped one that Sanjay uses on the Penn State tank), but those he stated he was happy with also, but are expensive and HUGE.
What I also found interesting was his lack of actinic supplementation, using only 10ks at Penn State and 6500s at home. The Penn State tank shots looked incredible though.
What was surprising to me was the difference in light distribution with all of the halide setups. It really makes you think about coral placement. Anyway you look at it, it was a great meeting. I'm also looking forward to helping out with the National Zoo.