Didn't use a skimmer or sump on my 55 gallon reef for many years. Now I have a Nano, 12 gallon long, and have been doing the same. Skimmerless and sumpless. Have always enjoyed simple systems but to each their own.
I have a Tunze 9002 in the middle chamber of my BC29. It pulls out some really nasty sludge. I've had it in there for 8+ years, no issues with regular cleaning.
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