I have a guppy fish tank populated by fry that I have raised. I have one male that is very beautiful. He is bigger then all my other males by at least 50% and he has a hump on his back. The hump is not a weird growth or anything it's just his form. His dorsal fin is long and impressive he has a beautiful large tail, bright baby blue with black specks. He is an impressive looking guppy. My question is; is there such a thing as a dominant male guppy in a school of guppies, who is bigger? I raised him from new born and there was nothing special about his parents.