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Could someone explain to me what the blue lights do in aquarium lighting setups? I know they take away the yellowish appearance of regular flourescent light, but do they do anything for the health of the occupants? And is it something only used for reef tanks? ...I need enLIGHTened on this...

I have a newly cycled tank that has about 10 or 12 hermit crabs. Eveything is well and I'm about to add some fish soon. Without anything else to really watch, I've noticed something about the crabs. Every night while the lights are out they all gather in the same hole in one of the rocks, and in...