Most fish at some time or an additional will have their fins bitten away by a fish known as by aquarists ‘a fin nibbler’. Numerous species of fish will, at odd times, develop this annoying habit.
The fins turn out to be frayed and jagged, but if the fish is removed away from any further attacks, the condition will soon correct itself. Nevertheless, should you really feel some action should be taken, a salt bath will do no harm.