Hi all

I have had my ball just a few days, I have set his cage up but the problem I have is that although I have about 2/3 cm of subsrate my snake just seems to push it out the way and lays on the heat mat, I am worried he is going to get burnt or at least to hot, the temp is 90 on the hot side and around 80 on the other but who knows what temp it is under him. how can I tell if it is to hot under him?

Thanks
Andrew