I was in florida twice since August for a week or more. Both times, the person who watches my tank was not available and I did a water test, which was good so added nothing and shut off ATO to avoid any catastrophes and topped tank as much as I could and left. I left lights at normal schedule and when I returned both times- The tank looked SO good.
If tank is looking good- do nothing. Light feeds their zooxanthellae within and they will thrive.
If needed- do your water changed and even buy a cheap wireless cam to place in front of your tank giving you the ability to view it if you wish to