My ambient tub temps have been ~75-78F. Never below 75. My room is ~73-76F. I've not had any issues with feeding/shedding or seen any signs of illness at all. Come summer, when things are warmer outside, the ambient temps I'm sure will be 80-82, as I keep my house 78-80F. I have a hotspot for them with my UTH of 90-92F.