Ozone Deaths - Brainstorming

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Recently thought I would give ozone a try. Seems like the smallest generator available is the Poseidon 200 which seemed like overkill. I ran across the Certizon C50 on eBay which seemed like a perfect fit. At first I wasn't seeing any results. The Quantum 120 just wasn't pulling from the ozone inlet. Might be because the way I am piping in fresh air to try and keep my PH up. So I connected a Hygger Ultra Silent 1.5W Fish Bowl Aquarium Mini Air Pump to the C50 at 30-40% to force air into the skimmer as a test. I immediately started seeing results. So I programmed it in to run overnight with a ORP 360 cut-off. I had carbon on top of the skimmer but I did not have any carbon on the output of the protein skimmer. I hadn't figured that part out yet. There aren't any reactors to attach to the output of a skimmer, or at least I couldn't figure it out at the time.

I thought I was being conservative. I bought a small C50 ozonator and ran it at 30-40%. A ORP 360 cut-off. Just a few hours overnight. When I woke up, my Flame Hawkfish was dead and Kole Tang was barely hanging on and passed shortly after. Two clowns, Royal Gramma, two peppermint shrimp, pistol shrimp, LTA, and all coral appeared okay. I did a 25 gallon water change and threw some fresh carbon in the sump and hoped for the best. A week later and everything else seems to be okay.

Red Sea Reefer 250
Custom Bashsea SMS 30-15 Sump
Nyos Quantum 120 Skimmer
Sander Ozonizer Certizon Model C50

What killed the fish? Was it the sudden change in ORP? Was the ORP cut-off too high? 15-20mg/h too much for a Reefer 250?

This past week I have been working to design a reactor that is custom fit to work with the Quantum 120 Skimmer. Here is where I am at printed out of clear PETG. The sources I looked at said PETG was ozone resistant.

It has to be better than nothing, right? It should hold at least a cup of activated carbon in a bag. It should still have some movement as long as it isn't packed too tight.