i have no expience with ozone use in ponds...whatsoever....
but having been in the insurance restoration business for more years then i care to remember, i am very familiar with the uses of ozone for odor removal, mold, and mildew, also safety issues, etc...
basically ozone hates rubber.....generally....it causes it to dry out as you mentioned, even in restoration applications (from improper useage) it has dried out seals in furnaces, etc....not a very good thing to have happen....
it is also heavier then air.....which means it settles to the basement or lowest point and then fills up the space from bottom to top...
and the odor is actually quite pleasant, like the freshness after a spring rain...but the tiniest overexposure leads to a headache like no other.....
not to mention a real overdose, what it can do to your lungs....
however, if you use it.....use alarms.....also place them low to the ground.....