I noticed my lemon tetras being a bit aggressive today... what surprised me was how they went about it... I assume they are establishing a pecking order, but do they also establish territories? one of them seems to be claiming the middle of the tank... but unlike my rasbora which "shimmy" next to one another, this lemon tetra angled itself at almost 45 degree angle and then swooped down to attack the other one. It look like a fighter jet swooping down. First time I notice this and was wondering if others knew what they may be up to.