As for me now my my dreams of experimenting with guppy evolution have been put on hold at least till I am ready for the commitment that it will take
personally I now find joy in making my own guppy population better I let my guppies breed freely only intervening on special occasions ( a female guppy who's batch I want to ensure survive for x reason or culling deformed fry)
what I do is I keep a journal with all the phenotype genes I like and what percentage of my overall population has them for example a long blue tail and when most of the population has it I then chose to keep about 6 or so of the fish in this case male and as many females that are related or have other good traits then I get rid of the rest ( sell them )
then for moths I restock my fish tank with a new characteristic Lets say i want to have a "jumbo size" guppy. I add just enough to rebalance the male female ratio
sure when doing this I do occasionally ( most of the time ) loose my initial traits ( the blue tails ) but I take personal joy in knowing that the over populations still has the genes from the original traits and do occasionally show it and it keeps them from inbreeding too much which leads to a mess of new problems or reverting to wild-like guppies.
I do get some unexpected and cool looking fish sometimes even a " jumbo long blue tail" and that's great when it happens- key is when you go out looking for new fish to buy, stick to one characteristic or that they at least somewhat look alike if you go out and buy little yellow ones long blue ones spotted reds half body blacks and throw them all in at once ( then theirs not much point to it ) you have no control over the populations phenotypes which is kinda what we want to do here to feel a little bit scientific
It's worked for me so far to kinda feed my inner breeder not to mention when I look thru my journal and see how much I've changed my fish over the last couple of years it's awesome specially when you realize that they are still all related to my original group
I've been doing some guppy hunting lately its time to add a new characteristic to the mix and I really do like the spots and snake skins so ill think ill add a those this time to kinda break up my solid black body red tails I currently have