Pszemol wrote:
"George Patterson" wrote in message
news:i96nf.14686$OK6.1492@trnddc03...

I would not say you *need* one, but I've kept at least one on my tank
for about 30 years. It seems to reduce the number and severity of
outbreaks of parasites like ick.

Have you kept a comparable setup without UV for 30 years to say
the one with UV has reduced number and severity of outbreaks of parasites?

I have gone through periods without a working U/V on the tank. I saw more ick
during those periods, and it spread more rapidly.

George Patterson
Coffee is only a way of stealing time that should by rights belong to
your slightly older self.