Both. When they hit sexual maturity it really ramped up between the males. I could always hear them splashing and hitting the lids as they chased one another literally out of the water. But I kept them with Heros and Geophagus, and they gladly chased and pushed the Heros around. I never saw them physically harm the Heros but it made them jumpy and irritated so I let the Aequidens go to a new home. The males were probably 8" at that time. I had a group of 6 in a 150 with a pair of Heros liberifer and some Geophagus sp. Tapajos.