Having overlapping territories with" P. polyodon" may benefit "T. moorii" individuals since "P. polyodon" removes silt from the rock surface as they feed. This allows "T. moorii" to easily scrape filamentous algae from the rocks. Having overlapping territories with "P. trewavasae" may benefit "T. moorii" individuals because both defend their territory from much larger "P. orthognathus" individuals. They also are able to drive them away, whereas an individual blunthead cichlid may not be able to defend territory successfully. This is an example of commensalism rather than mutualism because individuals would defend their territories regardless.