Robert wrote:
I've got the fish over here and have gotten some fantastic results
after playing around with the lights a bit. The black light does work
amazingly well for the glow-in-the-dark effect, but the room should be
completely dark for the best results. Otherwise, the best bet is a
bright white light, and the fish should look like the fish in the
pictures on the GloFish web site. It is really impressive!!

The following page has a lot of information on this:
www.glofish.com/display.asp

I saw them at two stores today. One had them under black light where I
agree, they didn't look great. The other store, they looked much
better. As far as we can tell, the black light didn't penetrate the
water enough to be useful to make them fluoresce. The other place said
they looked amazing as someone took it outside in the sun. They put a
reptile bulb that simulates the full spectrum and they looked much
better than the black/uv lit ones. Hope this helps!

-Ben