Ok so I am planning on breeding one of the two and I need yalls advice. I have about 4 10 gal tanks and a 20gal tank and a 5 if needed. I want to breed guppies but I can only get them from the pet store. I was wondering if I bred the petstore guppies would they weaken as I breed them? I am not looking for a specific color nor will I be breeding siblings if at all possible. I am planning on running the 20gal for probably females and 2 10s for the males and 1 10 for breeding and 1 10 for fry or 2 10 for breeding and the 5 for fry which doesn't leave alot of fry space tho! I am mainly just curious about the petstore guppie question above. Thanks! If anyone thinks I could breed swordies with that set up also and think it would be a good idea let me know cause I like swordies too!