Help with hear mat location

[guilletto]

Hi! I have just received the heat mat. The temperature of my vivarium is 21.9 C so I gotta increase it. However I don't know where to stick the eat mat. Theorically, in tree frogs I should stick it in a lateral, but my vivarium has poliuretane in both laterals. So, I could put it in the bottom.
My two dudes are:
1) Can I stick it in the bottom?
2) There is a lateral which not much poliuretane. If I put it there, a half of the mat wouldn't have anything behind the glass, and the other half would have poliuretane. would it be useful in this way?
Another thing relationated with last dude: waterfall would be near of heat mat. any problem with that?

[rottingtrain]

Put the heat mat under the bottom. It should not be in the center, but off to either the right or the left to create a temperature gradient. Also, for tree frogs I would not recommend a heat mat. What works better is a heat lamp.

[paul3col]

Put the heat mat under the bottom. It should not be in the center, but off to either the right or the left to create a temperature gradient. Also, for tree frogs I would not recommend a heat mat. What works better is a heat lamp.

Totally agree, I have had nothing but problems with temperatures caused by my heat mat.