That was me! And what I get for reading the fine print on the website (that the SpotCheck is "not compatible with the Octagon 20 Eco"). I'm going to order one when I call to get the foam dividers for the bars (which they do carry but you have to email or call since they are not on the US website).Someone posted that they did not have room for the spot check in their Ocatgon 20. See, the probe goes down the vent hole! I would take it out now though--try to get as much air flow at hatch as possible. All vents pulled and open!