Lise, great, put us on the spot!
i am looking up info now, but all of my books are telling me squat. i have one, but it is kinda old. i also have never had one. to gadgety for my tastes.
from the brief discription i have, i can see how it could cloud the water initially. as it is killing any small organisms that are flowing through it. once the number of free floating critters is neutralized by the ozonater the tank should clear up.
from what i have heard, they are difficult to keep dialed in. if to much is entered into the system, massive deaths could occur. i think most people use UV instead of ozone because of the risks.
sorry this is all i got. hopefully more will chime in. it is getting late over here on the right coast.
G~