They are not from Brazil, Centurion is in Northeastern Uruguay, the Rio Yerbalito has a pH around neutral, We check the pH at each collection location and Uruguay Rios tends to run from 6.5-7.8 with fairly soft water. I keep mine in tap with a pH of 6.5, Spencer breeds them in ponds in Florida with a pH of 8 and very hard water, so they are a very adaptable fish. I'd suggest acclimating them to you local tap water and don't mess with it. Ken