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Len

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FWIW, I use a red chainchain LED light to do spot viewing of the tank at night. I wouldn't recommend leaving a red light on for the entire night. Although I've found most invetebrates are nonresponsive to red light (Tridacna clams is most obvious example), most fish seem to be able to perceive the upper spectrums. I can't say for sure, but I'd imagine leaving red lights on over night may affect their behavavior.
 

2poor2reef

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I use a flashlight with the lens covered with several layers of rose colored plastic wrap. Works great and you can make it as red as you want by adding layers of wrap. Of course I'm very cheap...
 
A

Anonymous

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Places that sell astronomy stuff are a good source of red flashlights. Or, another cheap approach is to paint a normal flashlight bulb with red fingernail polish.
 

Chucker

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You can also find small imitation military crookneck flashlights that run on AA batteries. Many of these come with blue, white, orange, and red filters.
 

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