[Pavel Chaloupka]

If I see correctly these are mosquito pupae. Its eatable for fish, but they have harder body and quite a big head that is usually hard for small fish to ingest. Adult Sphaerichthys should be able to eat them without problems. But bringing these home may result in immediate hatching, so you need to prepare arguments for the rest from the family: No,the mosquitos biting you are not from my mosquito larvae that I feed to my fish. No! by any chance. 😉