OK I have my rack and it seems like every few days I am having to tweek my heat temp on my T-stat.

For example on Monday I will have every thing set correctly. Then Tuesday the front of my rack will have the proper temp but the back is too cold ( adjust accordingly) Wednesday the back of the rack is just fine but the front is too hot. and so on and so forth.

Also my top tub is always a couple of degrees cooler then the bottom some times as much as 6F. I have the probe on the heat tape on the middle rack.

I have my snake room heated to 80F so the front should be just fine.

I was thinking of burning some holes in my tubs to allow air flow but if that is not going to help I do not want to burn holes that will do nothing.