It is very challenging for the tank maker to make baffles (yes, these are the shorter glass panels that direct the flow of water. Imagine a maze.) in a 1ft width. My previous tank width is 1.5 ft, and therefore, I can still have approx. 4" for both the filter and the return compartments, leaving the rest for fuge space in the middle (in your case, constant water level for your tunze9002).
Btw, Ice-Probe is not powerful enough to cool a 2 ft tank. Tried and tested.