How long can corals go with the lights completely out?

Stomatopods17

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My mantis molted and its burrow isn't completely sealed up, so I unplugged the lights to reduce stress and simulate its in a fully closed burrow.

My only concern doing this is how the corals fair, little bit of every thing but SPS.

It's day 5 lights out right now, dragging it out as long as I can. She's doing great I can see bits of the molt, but not quite ready to 'emerge' yet which normally they'd be in pitch black for and otherwise could stress and kill it.
 

Freshwater filter only or is it? Have you ever used an HOB filter on a saltwater tank?

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