If it's more than the fin and down to the tail meat, it most likely will not grow back. If there's fin left, it can grow back, but only if the nitrates are kept low (under 10ppm at all times) by frequent water changes and the diet is solid. then it will have the ability to fight off secondary infections and heal up and regrow if it can.
Generally speaking, The fish should stay separated so no further injuries until it heals, and do the water changes and well rounded diet for 1 month and if it's not healed and growing back by then, that's going to be the best you get out of it. You should start seeing regrowth in 2-3 weeks if it's going to happen.
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