I find that culturing live foods is a bit addictive, but I think it's worth it in terms of the health and wellbeing of the fish and other critters I keep. I've had as many as six different species of single cell algaes going, plus rocks in a jar getting covered with the soft green stuff for some Otos to feed on. I feed the cultured greenwater not only to things like daphnia but also to my clams and filter feeding shrimp.
I keep wingless Melanogater fruit flies, because top feeders love the flies & bottom feeders love the maggots. I have springtails, also great for surface feeders, and microworms, moina, and a very few dero worms I hope will increase in numbers. I sometimes have daphnia & for awhile, I had some ostracods. I never fed those to fish, they didn't reproduce very well.
I wish I could find a source for more ostracods, they were really very entertaining to watch, for such tiny creatures. Supposed to be filter feeders, but they appear to graze just like most shrimp do. I just got some resting eggs, similar to brine shrimp cysts, for some fairy shrimp and clam shrimp, which are fresh water species from the Arizona dry lakes, which I hope will hatch and grow too. Fish food and pets all in one
I'm thinking about culturing black worms too, simply because they're rather expensive. All the fish seem to love them, even my very tiny little rasboras, which aren't even an inch long, take them eagerly. I have even seen shrimp eating blackworms. I also have Habrosus and Pygmaeus cories, and watching them yank worms from the substrate is interesting, given the worms are usually a good bit longer than they are.
I fish the worms out of their container, gently, with a chopstick and dangle them over my Betta's tanks too. They snag them off the chopstick, then chase the ones they miss down to the bottom. The Bettas were adopted, originally from Thailand, and one is such a picky eater, he would starve without live food.
It's fun to see the enthusiasm fish have for live foods, which is why I keep trying to find new ones to grow for them.