How long is night mode?

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Lyvric

Aquarium Advice Apprentice
Joined
Aug 24, 2012
Messages
15
Location
BC, Canada
I just got a fluval sea led fixture. I did not realize you could have a night mode! Is night mode just for 1-2 hours before/after my day settings or literally all night?

My tank is a 40 gallon. Most of my corals are sort, but I did recently get a chalice coral. does that make a difference?
 
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