Night mode - yay or nay?

[e46er]

this is a good question I will be following along.
I recently hooked up my 4-RW8s to my apex and they run 60-100% during the day and run 30-40% during the night ( numbers are ballpark but pretty close i cant remember exactly)
with my new 250G DD i ordered 2 RW15s i figure ill keep them both on the same side on a wave mode and have my other 4 RW8 along the back wall maybe 12" off the sand as I have my snapper return with 4 outlets spaced evenly along the back near the surface.

I havent noticed a difference either way in my corals, slowing them down at night but its only been a couple months running off the apex.
I may run the rw15s off the apex and run the 4 rw8s on their stock controllers on random mode as it seems to be alot more random than what the apex can do ( or what the operator can set it to do) i cant seem to get a full random mode going just 2 different %s.