So I admit I didn't plan my tank out very well. 75 gallons. I've got a Fluval 406 cannister and want to upgrade to a sump. Already got a HOB overflow. Problem is with my stand I don't have a ton of space to work with and it's an odd shape. I also want to maximize space used. I won't be putting a skimmer in it (already got a HOB one I like) and I would like to have space to try a refugium but if the area won't accommodate it I can always try a HOB one as well or custom make one. Dimensions I have to work with are: 20 across, 18 high, 14 deep. I wouldn't mind building one but am having a lot of trouble finding an aquarium or other similar container around those specitications. I'd also at this point consider buying a prefab sump if anyone has any suggestions around that size.