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That is an awesome looking guppy! Is there a reason some have large fan-like tails like yours and some don't? I have one that has a tail like yours (not the same colors) does that make it show quality?
The only major difference is that certain guppy lines are selective bred for finnage or color traits. That means the breeder basically pulls out the most colorful, biggest finned fish to breed rather than just keeping a mixed up group to breed (aka most pet store type guppies).