If you plan on ozone buy a adjustable unit. You also need a orp meter. This will show your oxidizing potential. Also not that a lot of plastics will breakdown with ozone. There are skimmers that are made for ozone and have injection points vertex omega is one of them.
You can achieve great results but please read about orp as it can and is a complicated value
http://www.reefkeeping.com/issues/2003-12/rhf/feature/