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Hypochlorite ion is made by applying low voltage (lots of current) to a brine solution. Other wet methods to get up to perchlorate ion. None of them make ozone first. You might do a google search on what is published on making bleach. You have to shatter oxygen to make ozone (>2eV). If you are interested in more than a few molecules of ozone each second, you have a large gas-filled gap, which means high voltage. You get a reduction in necessary voltage by reducing the gap and increasing the frequency. But the thermal efficiency is still limited to about 4% or less in air, and 8% or less in oxygen.

Various oxidized halogens are added to waters containing ammonia, to neutralize the ammonia to nitrogen gas and water. The process is called breakpoint chlorination, bromination, or iodation (etc.). and they are added in precise amounts... resulting in a rapid conversion (high rate constant). These are discussed in literature, and well known in swimming pool chemistry (probably inclusive of salt water aquaria). The same can be applied with ammonia added in suitable amounts to neutralize the "excess" oxidized halogens.

"breakpoint bromination"... add a stoiciometric amount of ammonia.