It's not so much the volume as having the room for the skimmer, reactors, etc. and of course there is the available space if you plan to put it in the cabinet. I have a 45 gal DIY sump on my 180 and an Eshopps on my 150, I love the Eshopps but its a little crammed. The best way to maximize space on the Eshopps is to drill for a bulkhead and run an external pump. I still prefer it over my DIY.
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