HELP HELP!! My tank won't heat up!!!

[rimelame]

Hello.

I have built a 3 section, acrylic tank. The acrylic is 6mm (1/4") thick.

The tanks dimensions are 72" x 22" deep x 18" high.

I installed a strip of 4" flexwatt along the bottom 70" long.

The flexwatt was set to 92 degrees all night... I came in this morning to check on the snakes.... the tank is 78!!!!

I want to put the sensor in the tank, but this may mean that the flexwatt needs to heat higher, maybe 100 degrees. I know that the acrylic can take it, but can the flexwatt?

I have read that it shouldn't exceed 95. however, as a test i heated it to 103 for an hour and it was fine....


please help!!

I have put the temperature probe IN the tank, and the temp is now fine.... HOWEVER.... the tape fluctuates between 111 and 125! (so far).

If the tape hasn't melted in an hour, should I worry?
If it doesn't melt over a 24 hour span... should I worry??