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Hypostomus plecostomus is one of many species of fish that is able to breathe air. Hypostomus plecostomus relies on its gills for respiration in normal and slightly hypoxic water, and the less oxygen present in the water, the more frequently it surfaces to breathe air.
I've seen a cleaning action with only one fish being cleaned, but this one was really a cleaning station with many fishes lined up to get cleaned. So, cut fishes in the left (convict tangs) and a fish behind the corals, as well as the corals themselves are part of the subject.