If your pond produces clear water (depending on definition of clear) then you could get a few pacu and perform your own test to see if they survive in your clear water. Do your best to catch them and haul them with as little slime removal as possible. Loss of slime is usually the cause of fungus on fish. It is good to hold and haul fish in a low concentration of non-iodine salt in the water. Salt helps maintain the slime layer. Use 30-40grams salt per 10 L(16oz/32gal). Pacu should not be harmed by a low salt concentration?
