My preference would be at least a 75g sump (4' x 18" footprint) to give you a decent area and volume to work with. Sumps are a PITA to remove and install so I highly recommend doing it once and leaving it, rather than think "I'll upgrade in the future". The thought of redoing all the plumbing, pulling out a dirty, stinky sump covered in saltspray & other nasties will turn most people off from fulfilling these upgrade intentions.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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