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I was thinking that i could use some old Christmas lights that were lying around. I would just replace all the bulbs with blue ones. Would this work? Or will it mess with my fish's behavior?
Cold cathode would work too, but I'd like to point out that you do not get the beam effect if the LEDs are spaced close together and they span the length of the tank.You may want to look for cold cathode lighting. It's a bit smoother looking and won't give you the beam effect. You can find those at the same computer supply sites as the ones previously mentioned.