I think its feasible. Like Delphinus said, he does probably have a lot of macro algaes to export some of the nutrients. I also think the 120L weekly water changes help as well. I think the combination of the macro algae, water changes, and the carbon he is running, that helps keep his tank so lovely.
I wonder if he siphons the sand, and what kind of other maintenance is carried out monthly on the system. I bet that information would fill in a few more blanks.
Didn't Beverly run her tanks skimmerless?
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