Why is it?

[EdKaz]

In my case it was moisture   My lights aren't hung I lay them across  the length of the tank.  I noticed that this one that was causing the problem was set right above the sponge filters.  I let it dry out, moved it forward a bit and all is good.  Sorry for my stupidity

Stupidity would be to not have a GFI hooked to a light that gets wet like that, and grabbing it SEVERAL TIMES ....while its still plugged in, trying to figure out why it just went out. 

Not that I know anyone THAT stupid  

[LizStreithorst]

lol, lol, lol.  Surely you are not talking about yourself. 

[Mugwump]

lol, lol, lol.  Surely you are not talking about yourself.

nyuk nyuk nyuk   

[EdKaz]

 

[LizStreithorst]

Love it

[Mugwump]

lol, lol, lol.  Surely you are not talking about yourself.

...and stop calling him Shirley....

[LizStreithorst]

I called him that accidentally .  It won't happen again

[BillT]

Stupidity would be to not have a GFI hooked to a light that gets wet like that, and grabbing it SEVERAL TIMES ....while its still plugged in, trying to figure out why it just went out. 

Not that I know anyone THAT stupid  

There used to be a fish store in town that I hired someone out of to work on campus. She said the store owner was like that except that he had the employees do the touching and he thought it was funny.