Another update, so I just saw elvis's first attempt at claiming a territory a minute ago. I walked into the room and looked for him, and when I found him he was tucked down in a cave resting. He woke up when he saw me, and as I peered in one of the tetras zipped by. Little Elvis flared up, his gills spread out, and he slowly emerged from his cave looking all big and confident. Meanwhile, the tetra had this look on his face like "your kidding me right?" and I cracked up. So Elvis started moving towards the tetra, all threatening and flared up, and the tetra just came up, flicked him in the nose with his tail, and swam off. That little tetra sure is sassy! After being easily outswam by the tetra, Elvis went back to just swimming around, like the whole thing was just a test run to see what his opponent would do.