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Depends on the fish. Fry need to be fed multiple times a day. Some select fish need fed twice a day. I feed my juvenile angels twice a day. I feed my africans once every 3 days. Most fish can go several days without food.
feed them a decent amount like enough they will eat everything in under 3 minutes once a day and you should but its not necisary to feed blood worm/ frozen brine shrimp 2 times a week when ever you feel like it instead of your regular flake in your case you may have to cut the little cube in half some of them are fairly large for that many fish...but on a side note your glass bloodfin will not do well on its own all tetras are schooling fish but in your tank i would get maby 2 more because of your limited space they need to have more of ther kind to be healthy