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Yes, the two swordtails will breed.
Different tail shapes don't matter, apart from male long finnned lyretails that (usually) can't breed as their gonopodium is too long and bendy
It's correct male lyre tails cant breed, but to carry on you need a male thats carry's the gene but dose not express it. Other wise you only get short finned fish from the fry.
Your get this is the fry you get in the feature from the female. so breed bother to sister and your get more lyretails back again
just don't breed from deformed fish
up to 8 adult Swordtails
that would be fine.