not to intrude but what should be the max heat temp in a tub my rack system? mine flux. and i have a herpstat but it will flux. between 89-96 and thats with 4" flexwatt and whats weird is its only like every other tub? i use the same substrate in all of them like one will be 88 one will be 94 and one will be 90 and some times one or 2 will be 96 and i dont know why my house is always at a constant temp around 74 but the room they are in is useualy 76-78