Should be fine but why do you have a UTH on the cool side too? Just need 1 on the hot side and then dial the CHE in until you get around 82F or so ambient temp. I keep Dottie at 78F cool side and 82F warm side for ambient with a 90F hot spot with a UTH on a Herpstat. I keep Vicky the same way and Rosey is on a RHP with 80F cool side and 86F hot side. I don't use UTHs on PVC cages. Never was really fan of them but they seem to work ok for glass tanks.