It depends on what you are going to put in it. I would go for as big as you can fit under your tank. You need to have room for your return pump, your skimmer if you are going in sump and a refugium if you are building one. Plus it needs to be big enough to hold the overflow from the tank without running over. Could you fit a 10g or 29 g in there?
I am afraid a 5 gal might not hold enough overflow incase of a power outage.
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