I have the reef octopus bh-1000, which i think is the model below the one ur looking at. I have the same problem with my 55, it's too narrow to fit anything underneath. The skimmer works great, the only problem I've had is there are almost no instructions for it, the ones that come with it are extremely vague. I have had problems with the water level in the skimmer, when I top up my tank it occasionally starts overflowing. But that is easily solved by making sure the blue sponge isnt pushed down to far. Over all it's awesome.