Usually when betta fins tear its either they torn them on some sharp objects (or sometimes even due to filter outputs/intakes)... or they may be ill or stressed and the fins deteriorate and tear as a side effect.
Maybe check your tank's parameters, like ammonia, nitrites and nitrates, see if those are still at okay levels.
Most of the time if the betta is healthy and the water conditions are good, their fins will usually naturally heal back on their own.










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