So I have 25 Umbee at about 2 inches in a 135g. There is one cave and there is this tough buger, one of the bigger of the 25 that has claimed that cave and will not let any of the other Umbee in his cave lol, I mean he literally chases all 24 of the other ones away lol. He is also darker then the rest more blackish. I have never owned Umbee before but have heard they are mainly peaceful up untill about 5 to 6 inches. Do I have my self a umbee that will be a crazy nut when bigger or is this aggression quite common even at that size?