by the way, do you have any advice on breeding water fleas and fairy shrimps (and maybe triops too??) because I always wanted to have these as pets but my populations either never hatched or died very soon..
Hmm, for fairy shrimp I have only ever either bought sea monkeys or cultured fairies and fleas directly via taking soil from their pools and then rehydrating it. I got it from protected land though (I was working on a field project). I can’t in good conscience recommend running around and taking soil from vernal pools. I’ve tried to catch live Daphnia and keep them in a fishbowl just for fun but they didn’t do well as you said.
Have you looked at science supply companies like Carolina Biological? I bought some mealworms from them and it worked out for me.