First thing would be removing the fish that is attacking the Beta's fins. If it is not a fish, the Beta may have a disease such as tail rot-in which case you need to isolate the fish and treat it. But there are supplements that can help with the health of the fish.
Yes the tail fins will eventually grow back but they will most likely not be as good as they were
there is 1 reason that i know of is that older male bette's will lose there fins. "Dont wory they'll grow back"
my pleco has damaged its side fins will they grow back
yes
yes they can I had one that grew fins back in about three weeks
Yes; fish fins can regrow and heal with amazing speed.
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Provided the reason for the loss of fins is removed and the conditions the fish is living in are correct then yes the fins will usually grow back. They will however never be as good (well shaped) as the originals.
The Fin regrowth time is Relative to the amount of damage Done, A beta's fins Grow at about the same Rate as a humans finger nails. Hope this helps.
Giving the fish exactly the correct water parameters for its species and good food will help it to recover as quickly as possible. Fins grow on a fish in a similar way to humans growing finger nails.
Provided the fish is given proper food and good conditions, yes the fins will grow back. The new fin(s) are never as perfect as the old ones. There is usually some deformity (scarring) resulting from the damage.
nope