Is 3-175w metal halides and 2-160w VHO enough light it's 845 watts total.
IMO is PERFECT!!! great growth and very healthy looking corals! its what i use and prefer anyway
as far as which actinic i use super actinics becaus ei run 10K halides.. if i were to run 20K halides i would tone the blue down and only use regular actinics or maybe 50/50 since the 20K halides throw alot of blue!