I know UV will kill free floaters, but my understanding is that if you don't hyppo or qt and your tank gets ich by having a uv it will take a few cycles to eradicate the parasite. Meaning as an example:
10 Parasites Cycle 1 goes thru UV, kills 3 parasites and after on the next cycle
7 Parasites survive Cycle 2 goes thru UV, kills 3 parasites and after on the next cycle
5 Parasites survive Cycle 3 goes thru UV, kills 3 parasites and after on the next cycle
3 Parasites survive Cycle 4 goes thru UV, kills 3 parasites and after on the next cycle
1 Parasites survive Cycle 5 goes thru UV, kills 3 parasites and after on the next cycle
0 Parasites survive Cycle 6 goes thru UV, kills 3 parasites and after on the next cycle
If your fish survive all those cycles wouldn't that kill the ich on the tank, however it would be a crime towards your fish but I'm assuming it would kill everything on the long run. I don't know if you guys understand what i'm saying.
Raf