I think you are referring to a 24hr blackout. With that in mind:
You are going to have to keep the light off of your tank somehow.
I realize that moving the tank is quit a chore. Maybe window blinds?
A skimmer helps and not cleening the filters helps.
Basically all the above, lol
Also, A bacteria bloom (causeing cloudy water) can deplete your tanks oxygen levels. Make sure your water has ripples on the surface!
I know I am leaving something out! What?
HTH