i have a 10 gallon tank and a 2 gallon tank and want to buy 2 male and 4 female guppies. i want to breed the guppies until i get a new line of color. so i figured if i had a blue male and a green female made them have fry then mated the daughter to the father to get more fry then finaly mate another female from that drop to the first father and when those fry are born start breeding brothers with sisters. i was wondering if i would start to get guppies almost exactly to the father but i want to know it this will harm the guppies. like make them deformed from inbreeding.

thnx