My sumps are used as refugiums as well. I also use it as an extra holding space for frags & fish if necessary. A large sump gives me more water volume to work with & any extra equipment can go in there. Bigger skimmers fit better in bigger sumps, for instance.
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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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