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Hi Derry, and
[welcome]
The detritus doesn't gather in the LR rubble because of the downward flow. It may settle in the skimmer section, or in the return section. As I mentioned, I simply siphon that out of my system once in a while (every 6 or 8 weeks), unless I'm especially energetic and motivated to do it more often.
Waterborne detritus may be sucked right in by the protein skimmer since that is the very next thing after the bubble tower.
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Marc Levenson - member of DFWMAS
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