Right, I guess I should have been more specific:
So I'm not expecting the UV to fix the problem entirely, I was referring to the free floating stage of the parasite.
I've been reading up a lot and watching a lot of videos, and from what I've gathered there's three levels of UV sterilization.
The first just helps with algae and bacterial blooms, but the second type degrades the DNA of the parasite while it is free floating and prevents it from reproducing.
I was looking at this:
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But it's not exactly what I'm looking for.
I have no sump or refugium, so I'm stuck using HOB/side-stick equipment, and in-line is out of the question.
I'm looking for the UV to help manage the parasite and reduce chances of severe infection, even if it doesn't cure it.
Even then, I would hesitate to believe the UV will be a solution. There are ones like aqua advantage that might be what you'd be interested in. @Jay Hemdal might have some advice for if these are even worth your time.
I would just put the fish in a bin with cycled rock or media, some cupramine or copper power, and leave them in for 45 days. Everything else can remain in the display. I don't know how much space you have so if this isn't possible I completely understand!
One alternative for the future is to purchase the fish from a place that pre-quarantines them. This is what I do nowadays.