I feed my DT and refugium every other day. 90 % of the time I use frozen. If not i do Flakes.
The approach that have worked for me as the best, is to be consistent with the amount and type of food, as well as the frequency. From time to time, once every 1-2 months I do not feed for 48 hours. But this last is not really planned.
I also stopped adding all that coral food that I was using (reef roids, etc etc) I don't even remember their names. All my corals feed from all the biological trash that is moving all around and light. I do not have any mechanical filter to stop that trash because is good for the tank. All I have is biological filtration (a lot) and the skimmer that is Setup for wet skimming.