Why do you think it would be bad to breed from this batch you got from rapps? Do you think they are all from the same family?
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There is a very good probability they are related. Imagine a group of fish this small in the wild. Where did they begin their life? Odds are they were from the same parents & they stuck together in the wild because having more staying together increases each of their odds to survive. So then when the fisherman collects, odds are many, many of them are from the same 2 parents.