I wouldn't worry too much about a spot of 68 on the far end. Don't let that 93 get any warmer that is a too warm. This time of year my females with seek out the 70 degree end of the tub and 'chill' out there.
I do find that using reptibark, or mulch spreads out my temps a little better. you can also move the UTH more towards the middle rather than the far end to keep the ends
Reply With Quote