Need your input please

[niloc16]

my next step in this dino or cyano war is to shut the lights off. i was thinking of doing a 2 to 3 day black out after a large syphoning water change. now most of my tank is sps, do you think they will be ok for this length of time? i am assuming they would be because in the ocean not everyday is perfectly sunny, but i would like your input or experience. thanks in advance guys