Illness/Sickness: Axolotl Attacked by Tankmate, Please Help

[koeli]

(apologies for the bad image)

I recently introduced a new axolotl into my aquarium - in hindsight I shouldn't have done that without a divider first - and my black one was attacked and had their leg ripped off and has a cut on their wrist. I have tubbed them, and I do 1-2 100% water changes every day, and I make sure to keep a fan on them at all times. Just wanted some advice, as I've never dealt with a sick axolotl before. Thank you in advance. ♡

 

[wolfen]

use 50% holtfreters + 0.1g/l magnesium sulphate in the water to make sure the water chemistry is good and to reduce chances of infection.
if possible get divider fitted for tank so he/she can go in tank as regrowth will take time and can be done in tank.
even if both axolotls are similar sizes they can mistake newcomers as food/prey and attack each other, make sure they are well fed to reduce attacks.
make sure to provide a varied balance diet for optimum healing.
info holtfreters here.. Axolotls - Requirements & Water Conditions in Captivity
monitor your water parameters once second axolotl is in tank as waste production will increase putting strain on your filtration.