Freshwater Stingrays

[C3ntury]

For reference purposes, Potamotrygon spp. can certainly be housed with a variety of fish spp. (piranha included) and still able to grow/breed. They are fairly tolerant of water parameters as well; Stability is key. IME the reason for the "mythinformation" of difficulty in care is:

Lack of diligence.
Illegal status in many states leads to presumptions of difficulty status.