Ok so good question,but here's a better one. What does skimming remove?
We can't answer the first without knowing the second.OK so we all know they remove DOC,and free algea.But what else is skimmed out?
I just reconnected my RS135 to my 40g after running skimmerless/sumpless all winter.I guess that would be at least considered heavy skimming.
Skimmerless is good as long as your willing to do large weekly water changes.