I'm no expert on the matter but as far as I've learned and experienced, the main things to be concerned of is being able to house enough media for the bio-load of your tank, somewhere to put your mech filtration with easy access, and then room for your return pump and other things you would like to house in your sump. I like baffles because it stops the fine particles passing through your mech and into the return area. Of course the more water volume you can add to your system is always better but if space is concern than the biggest dump tank you can fit.
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