Hi guys. I don't plan on owning any freshwater stingrays anytime soon since they're illegal in my state. But I'm just curious about them and have been researching them for a while and would like to hear from some of you stingray fanatics. I know that potamotrygon/paratrygon are from the Amazon river and that a majority of them get huge, 2-3 feet in diameter. So obviously a large tank is needed for a single specimen. Many are sensitive to poor water quality and they like soft water with a low PH....is there anything else?