I was wondering about trying to selective breed guppies. I have just 2 10 gallons, but they seem to be the best fish I can breed in that size of tanks. I have 4 young half black tuxedo guppies I think. They are probably siblings. I got them at a LFS for cheap. If they have fry I'd like to find a new bloodline to mix in there. Should I get more from the LFS or get some online? I'm don't have a ton of money to blow, so they have to be at a reasonable price. I really have no clue how to selective bred. I know you're supposed to keep your best fish from your batch of fry and breed something good with them and so on, till you have what you want. What are your thoughts?