Everywhere you read it says to keep rays in soft water with a pH of 6.0 to 6.5 for some species and 6.5 to 7.0 for others. I know people on here keep there rays in harder water with higher pH's. I have tried searching with the search feature and reading stickies and can't find much info on who keeps there rays at a higher pH. So who on here keeps rays at a higher pH and what kind do you keep. My tap water is 120 ppm or 7 deg DH which is at the bottom of being hard and my pH is 7.5. I figured motoros can live in water with my parameters, any other species?