yep. As long as his gonopidum is normal sized there is no problem. You are liable to get a mixed batch of fry though.
I have hifin lyretail swordtails and lyretial swordtails.A couple of them have elongated gonopodiums and they still try to breed. I'm not sure it does them any good, but they keep trying anyway.
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Here are a couple of pictures that show the elongated gonopodium
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Hope that helps.![]()