These will be going in my custom cages... Theyll be inside taped to the wood and then covered will thin piece of vinyl... Looks like im going with the 11'' and itll be 2ft on the hot side and then 2ft on the cool side. All the hot sides will be on the same thermostat and all the "cool" sides on the same... Since I have 5 bigger balls and 3 07' babies Ill use the other 2 probes for a hot side cool side in the smaller tubs... do i make any sense? haha