I have three #4s in my 75 gallon. I was running one at night but as of recent I have been keeping them all on during the day. TBH, it's perfect IMHO. I have a couple of puffers, and neither of them have any trouble swimming around. The tangs LOVE it. I will however say this about the Koralias. Their dispersion is so great that after a couple of feet, they lose alot of force. In a large tank such as the one that you have and the one you are getting, a good locline setup should out perform the Koralias. I have one in the front corner right side, back corner left, and back middle, almost on the sand pointed up as far up as it will go. For softies, a CL may be more overkill than my 3 #4s.