In my experiences, I have come to realize that every fish has it's own personality. Some are similar to their stereo-types, others not at all it. I had a candy hog for a few years, maybe about 4 ish, and in the beginning he was a great fish ( He was little when I got him). Didn't bother anyone. Then one day he became a terror. Chasing everything in the tank, big and small. And it's not like I have a small tank, it's a 125 gallon, so he had plenty of space. He was all over every inch of the tank, chasing fish into crevices in the rocks. He would harass my chalk bass so bad, that as soon as he would poke his head out of the rock, he would speed over and hover over the hole for a few minutes to make sure he didn't come back out. I do not like returning fish to the LFS, but sometimes it has to happen. I couldn't let my entire tank be terrorized by a 3 inch fish. Hopefully yours won't be a beast! Good luck!