the zeo does give the corals a pastel look. however, the old light setup was just too yellow and the colors of the corals couldn't achieve their potential.
with the new lights, i've seen so much more color because i have the bulbs dimmed down to be as blue as possible.
additionally, i have pretty much stopped dosing zeovit lately. i still dose twice a week, and occasionally in between, but i cut back because i am going to break down and redo the tank.
as for flow, i love the vortechs, but they are not enough for a 6 foot tank by themselves. i have a tunze 6105 on there that is simply amazing. it puts out 3434 gph...which is about 234 more than the vortech. i have it on the left side of the tank and it has created a hole in the sand (all the way to the glass) on the front right corner of the tank.