My protien skimmer doesn't always seem to produce scum. It seems it only produces scum a few hours after i feed my fish and corals. Is this normal? Is my tank water that clean?
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It is my understanding that skimmers do not remove nitrates. They have no capacity to interact with NO3-. They only remove organic compounds, which upon decay become ammonia, which is broken down to nitrites by bacteria, which is broken down to nitrates by other bacteria. Am I wrong?