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Personally I dont think either do a great job fighting ich. Quarantine everything that goes into the tank and you will never have ich. UV is way to inefficient because it only kills what passes through it and only if the flow rate is correct. Ozone is pretty much the same, although I would say more efficient. The problem is that ich does not spend a heck of a lot of time in the water column and neither ozone or UV can kill it when its on your fish or in substrate or rocks.
Having said that, I run ozone and love it for many of the other reasons. Much less algae in the tank, better water quality and very clear water. If you want to set one up, go ozone but make sure you do your homework about setting up correctly.
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