The Ps. "Aggressive Grey Head" is found at Nakatenga. The Ps. "Aggressive" group is named so, due to their aggressive defense of territories, by both the males and females. They cultivate aufwuchs "gardens" within their territories, as their food source. Due to the shape of their teeth, they are unable to pull the algae off the rocks, as M. zebra does. They end up digesting the diatomous algae, in addition to any organisms living on the algae strands. Males will always have a cave within their territory, that they utilize for protection, as well as spawning.