Hey guys im new to the forum, i have done lots of research on stingrays, im looking for one, I have a humerosa stingray on back order from the local pet store I had one die on me right away, water was perfect dealer thought it was just stress, I just hated seeing it go into the death curl, it was quite sad. It was in a 55 gallon (upgrading to a 250 soon) i know the 55 is to small for it, I learned that freshwater rays cannot have any salt in the water is this correct? I had put aquarium salt in because i had heard it helps freshwater fish breath easier and brings the stress level down. thanks