I was thinking of that too, but got scared of detritus that might get trapped in that funky space and figured hey at least stick a heater in there to utilize this dead space.
What sort of ceramic media are you using? Blocks? rings? ANy detritus problems?
My guess is the designers meant that space to be a water volume buffer so when the center section drops you don't starve the pump as fast as if they were not present. Filling the spaces with hardscape would defeat this purpose somewhat. Of course, this assumes my assumption is correct.
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