I was wondering what other people do to raise their fry. Specifically but not limited to how you feed your fry.

I understand I'm not the expert here but this is what I do.

I colony breed, so don't change the fish to fry tanks. I currently change water 75% once a week (I know I could be doing more). I feed my fry live food I've cultured once per day, and sometimes twice a day, mostly microworms and sometimes Vinegar Eels but the fry are getting big enough to start taking something bigger. I also feed them once to twice a week human grade powered spurillina bought at a health food store in hopes that this will help balance out the gut loading I'm doing of all these live foods. Lastly, I put plants in the aquarium for a couple of reasons. One is to create some foliage for fry. Another is it helps the aquarium chemistry.

Here some of my personal questions I hope to get answered through this post, however primarily I posted it to hear what others do for raising fry. Is the extremely small sized of the powdered Spurillina good enough for my fry? Would it be wise to invest in some sort of spurillina flake food or veggy food for them? Is spurillina good source to help balance out all the fatty live foods I'm feeding fish with. Am I feeding it frequently enough? What other good or better sources may be recommended for help cleaning out the digestive system or at least balance out the diet of my fry.

A lot depends on the species. My Nothobranchius fry get infusoria to start. My molly fry used to get crushed flake because they were big enough. Baby brine shrimp is excellent when fry are big enough.