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can a uv led harm a fish?

What do you mean by a UV L.E.D?

Like a normal UV light that steralises the water?

or something else?

Did not know that they had LEDs that produced UV. But I would guess yes, as UV will harm DNA of all living creatures.

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There is always a bigger fish...

I assume you mean blacklighting, not true UV? Like the "UV lights" I have in my computer, or the "UV" you get in clubs. They are not high powered and dont have any DNA damaging effect as they only emit low intensity UVA

I use a UV cold cathode for a while, but found that it upset the plecos and other nocturnal fish. I used a dark blue cold cathode light instead, which didnt upset the fish, but still lit the tank. The drawback was I had to power it off a standard ATX PSU, which near water was a tad hairy, and I got rid of it in the end.

Last edited by tiny_clanger at 13-Apr-2005 17:15

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I like to think that whoever designed marine life was thinking of it as basically an entertainment medium. That would explain some of the things down there, some of the unearthly biological contraptions