I have 100 Gallon fish tank with 4 small fish and wanted to get some more and thought it would make economic sense to get some free fish so I found some in a stream and fished out 4 of them. Not sure what kind they are but they are long and sleek with a sort of tiger pattern on them. I introduced them to the tank and after about a day they started to corral the other fish who have been in the tank for months. They chase and bite small pieces of their tales off and the original resident fish are looking rather beat up. I talk to my fish, I know they can't understand what I am saying but I tell them they don't have to compete for food and it's not a dog eat dog world. I care for them all as equals and they should live in peace because there is plenty of food. These new tank mates just don't seem to understand. I could take them back to the creek but that would be so un fair. What would you do?