just an FYI for people considering using ozone. all water thats exiting whatever you choose to use as a reactor(skimmer, O3 reactor) should be actively treated with GAC (carbon).the carbon treatment isnt intended to remove excess O3 but product's of O3 reaction with bromide. bromide is a common element in sea water, salt mix's and calcium additives. O3+bromide can/will create hypobromite, bromate, bromine (bromine is just like bleach)
Ozone and the Reef Aquarium, Part 1: Chemistry and Biochemistry by Randy Holmes-Farley - Reefkeeping.com