Platinum White Halfmoon Male - Fin/Tail Rot

The white platinum halfmoon male has been recovering in the last couple of days from his wounds from the failed attempted at breeding the pair.  It seems that certain parts of his fins/tail has started to develop fin/tail rot, a very common disease when rip/torn fins happens.  I have change about 50% of the water and put a antibiotic (multi cure) into the water.  Hopefully this will kill the disease in the water and help his tail/fin recover quicker.  To a Betta fin/tail rot is like an open wound to us and it not treated properly infection can set in and kill the Betta.