There will be no big problems in inbreeding of guppish as long as it does not exceed 3 generations. Inbreeding can ensure the purity of varieties, so breeders will not have too big problems as long as they inbreed within 3 generations. However, after inbreeding for more than three generations, gene degeneration may occur. Moreover, after more than three generations, the quality of their offspring will also deteriorate. For example, after 3 generations, inbred guppies may not grow much, and they may die in the womb.

1. Feeding alone: If breeders want to ensure the purity of guppy breeds, it is best to raise them alone. When breeding, we should also choose the same species of guppy to mate. Breeding small fish should also be fed separately, so as to avoid their natural reproduction.

2. Breeding multiple guppies: Although the purity of guppies can be guaranteed by mating with each other, the breeder cannot allow a pair of guppies to breed all the time. It is best to diversify several pure guppies, so that they can avoid genetic degradation caused by inbreeding. However, the price of purebred guppies is relatively high, so breeders need to take good care of them to avoid their death.