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you can add moon lights if you want. they dont really DO anything. just light up the tank a bit, im a moonlight kind of way, of course.
 

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it lets you see the nocturnal behavior in fish, also sets up some breeding cycles for fish but you need to do a lot more to actually sucessfully breed them
 

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actually many corals need the wavelength of light that actinic blue lights emit.
if you want healthy corals that will grow and reproduce blue actinics are a must
 
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