If you haven't already check these out in the reference library.
http://www.canreef.com/vbulletin/showthread.php?t=22097
I'm running a 200mg Red Sea controller and have had no problems. If you are not using a skimmer there are not alot of choice for reactors, I only know of two, the MTC and the ALS (not counting the Coralife).
More info on page 4 of this thread
http://www.canreef.com/vbulletin/sho...=ozone+reactor
It's recommended to run ozone effectively and safely you should use a skimmer or an ozone reactor with a controller, an air dryer, air pump, and carbon filtration on the water and air outputs.