I don't attempt to replicate in the aquarium the frequency or infrequency of feedings that they get in the wild. Why would you? I don't see the benefit.
Juvenile fish need frequent feedings to grow strong and protect themselves (build immunity) against bacteria and parasites that they would not be exposed to in such high numbers in the wild.
What a young fish needs in a closed system ( the unnatural parameters of the aquarium) is not what they need in the wild.
Once a day feedings, and certainly skipping feeding 2 x weekly will be a detriment to young growing fish, not beneficial.
With adult fish, a once a week "fast day" is necessary if you are prone to overfeeding your fish during the week, don't feel like feeding, or don't do
weekly water changes. It benefits you, not the fish.
Now for certain species, like a goldfish, where you supply a feed such as pellets as their primary diet, a day of fasting or feeding with peas is therapeutic. But, even then, it is the lack of variety of feed and the reliance on processed foods that necessitates a fast in the first place in these fish.
Just my take.