I think Ozone can be highly effective in a higher nutrient tank(such as if you have a DSB) I have a BB Tank, and ran ozone for about 3 months and didn't notice any difference. My ORP went up, but, besides that I didn't notice any greater water clarity or any of the other beneficial things people have claimed. I notice many of the people that claim such great experiences also have DSB, and therefore have "dirtier" water. I am not trying to start a BB v. DSB argument, just saying what I experienced.
Dave