Goodness these panchax are really territorial. They are not only not afraid but they think my elbows are food! Developed some rashes after they nipped at my elbows while doing some trimming for my plants.
They only whack their own kind. Dont like to see each others face. Seem to leave other tetras alone. Besides they dont seem to swim fast enough except at the surface. They nip on anything which moves on the surface.