In my old sump, I had a plastic tub filled with 7" of sand as my internal "remote" deep sand bed. That way if I found it wasn't working, I could pull it out with little effort, as opposed to scooping out lots of loose substrate from the bottom of my sump/refugium.
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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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