I decided to do a KFC bath daily on a torch that is looking really bad and can’t find anywhere online if there is an ideal time of day to do it. Apologies if it’s addressed somewhere else. Is it better to dip when lights are off so the torch gets a full day of light? If there’s no difference I’d probably dip during the day for convenience. Thanks!

It obviously won't offer much usable light for photosynthesis but a little bit is better than nothing. Maybe your coral actually enjoys the break if too much light was an issue 