Feeding fish is a bit tricky, I haven't used anything dry in about 4 years.
I normally have three cultures running (when I'm stable) , outdoors I have two buckets mostly green water, indoors grindal worms, vinegar eels. I buy Daphnia from the LFS once a month or so, and normally add to a bucket, and to a tank. Fish normally get a breakdown of something different a few times a day. For the veggie fish, spinnach, and cabbage are my go-to.
A few years ago I came up with the idea of defrosting a selection of frozed foods, then splitting them into smaller droplets (onto tinfoil) so I could feed a selection of frozen foods at once - works fairly well, but I am not currently doing that due to limited freezer space and lockdown storing 😳.
For the last few species i've kept, rearing snails has been a prerequisit, or atleast buying them (Badis Badis, Badis Ruber, and now Carinotetraodon travancoricus).
Every fish is different, and I haven't kept anything big enough to eat whole insects, whole frozen cubes would be a terrible idea.
I find BBS to be the most irritating food to rear up, I've only done it few times and I won't do it again - I don't have the space.
Vinegar eels are a lot easier to grow and I think fry love 'em. They move slowly, and wriggle.
Grindal worms I often forget I have, adding a pinch every now and then.