blackout length without killing coral & nem

my tank gets extra zoo plankton, and say mysis rotifers after lights out just for the corals. I hand feed the Nems shrimp west coast cough and bought from Steveston dock so they are fresh and full of nutrients unlike the one you buy from the stores they have been washed and cut in many cases and any eggs have been stripped from them not the one from Steveston docks. they are fresh and if they have eggs then they go in also fish like them too. I do take the shell off them but other wise I include everything my nems are spoiled they don't et the shrimp as redily with the shell on.

Bill