ok right now in my big 175 gallon tank i have 3 ball pythons,,ones 4 ft and ones 3 ft and ones 1 ft,,all are happy but i want to make sure all is well with temp and water and stuff,,,i have a big water dish in the middle of the tank which is probably about 4 gallons,,,i have the heat light at one end and the hide at the other end with uv lighting at the other end from the heat light,,,thermometer is on the cold side where the uv lighting is,,,and is showing 73 degrees,,,but usually says 75,,,anyways do i need to add anything to help them be comfortable? i see one of the balls is now showing signs of a RI and i want to make sure its not something im doing here,,thanks