I try few times , is very true , make water clear ( just like Active Carbon) i use on day time only, i use 80 mg , unit push 200 , i got around 450 Gal. system, i decide to stop, use just like monitor ORP.
Yes, smell , if you have the tank close were rest , i will not suggest , even if you use Charcoal ( to remove the rest of Ozone you use ) also will be great if you check the moisture in that specific room you got the tank .
Bottom line is this, you are the judge , if your tank is doing well , just ignore the Ozone, dosing Ozone may kill some bad bacteria , etc. but kill the GOOD bacteria in the same time , just like Hydrogen Peroxide , try some how to keep Nitrate 4-5 ppm , steady, PO4 keep 0.02 to 0.06 then you have strong immunity tank .
In my opinion.