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My bad about the forum topic, I had decided on going down to a 40g to make it easier to light the tank, and for the rock placement, etc. I believe sumps are supposed to be 10% of the volume at minimum, so I think when I measure everything out, I'll make sure to get the sump last, and to adjust what size sump based on how much room everything else takes up.Just me but a sump of 20 gallons or more is really recommended as is a pre-drilled tank if you go with a sump. To me a 10 gallon sump doesn't provide enough extra flow to be worth the effort, nor does it offer enough room for decent equipment (ie good skimmer and return pump, which are generally larger in size), furthermore it's super cramped for equipment when you need to work on it/clean it. I have a 29 gallon sump on my 90 gallon and definitely wish I had a 40 breeder for a sump on it. As mentioned above, the other issue is that if the tank isn't drilled you will be likely be looking at an overflow box which can be a pain as their siphons can become clogged and are more prone to overflow issues. With a predrilled tank the sump is as simple as the plumbing, a filter sock (if you chose to use one) a return pump and the skimmer. Honestly if it were me, I would actually bump it up to a pre-drilled 75 gallon tank as it will give you more useable space for your fish and open up your stocking options considerably. 55 gallon tanks are good for length but are too skinny on the width for many fish.