Dead things? plumbers snake or creative use of a mag float...
I've seen a few of these over the years pop up on various boards... Generally they've got some water flow through (bigger powerheads mounted to push/pull water through, you can spy it in a few of the pictures - but you also need a run of plumbing between the tanks (keeps the levels equal in each)
I think the biggest technical challenge has to be initial priming - and regular draining of air - obviously that coffee shop one has been neglected...
I'd imagine one would add another hole to take excess water in case of a dump to a drain... (simple hole drilled at top of tank)
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