Ahh neat. The tub has small indents where the probe fits nicely(the probe is also very small) so I don't think I'll need to make more room, but if I ever have any issues with too much heat I'll definitely keep in mind about the foam blocks. Good to have a plan, especially since this is gonna be the first summer we have him! Definitely taping it in place now. Thanks for your help guys, I was super worried but I think my dude's gonna be okay! I appreciate the help!