What power CHE for a 4x2x2

[TheCoreyHall]

Hey guys Ive got a 4x2x2 tank and trying to figure out the wattage of a CHE Im gonna need to keep it warm at night. I underestimated and got a 60watt first off and that doesnt change the temperature at all. Would a 100watt be sufficient for that size of tank or do I need to go even higher?

Thanks in advance.

 

[CooperDragon]

100w should be fine, especially if you put it on a dimmer to fine tune it. You don't usually need much heat overnight. Just enough to bump one area of the tank into the low 70s or so.