NEONCORY,
They are in a 135 gallon tank. My temp is set at 81 degrees. The ph is 6.4. I have well water. Sorry, i can't give you a reading on the hardness. I never tested that yet. Ammonia 0, nitrites 0, nitrate kept around 25mg.
Their tank mates are 9 juvenile koi angelfish, 2 medium adult...