I go on a couple of levels with feeding decisions. If I want the fish to either grow more quickly or to breed, then 6 days a week. In a maintenance tank for adults, I'll fall back to 4-5 times. With elderly fish, 3-5 times a week.
I want egg production from breeders, but I don't want to over do it. I no longer have a big collection of Goodeids, which I had 20 years ago when when my water was hard, and feeding decisions were harder. I have basic softwater insectivores now.
I feed flake or prepared foods maybe once a week. Most feedings are live food - wingless fruit flies, grindal worms, artemia nauplii and soon, mosquito larvae and daphnia. I expect my outdoor daphnia to come back when it warms, but just in case, I'll be checking some vernal ponds with some of the younger aquarists in the club. If the tank isn't overcrowded, while Daphnia isn't the best food, it stays in there for a few days.
If we hit a good pond, we should be able to freeze a few kilos of daphnia and mosquito larvae mixed before the heat makes the Daphnia fall away. There might even be fairy shrimp. If not, looking's an excuse to walk in the woods.
I'm probably going to buy some Daphnia moina eggs this year. The last time I tried, I brilliantly tried to sprinkle them onto green water when a gust of wind hit them mid fall. Ooops. That's worth trying again, more intelligently this time.
