Illness/Sickness: Injured/sick Axolotl?

Hi all, I have 2 axolotls bought from the same shop at the same time from the same tank together. One is slightly bigger than the other and looks as though the bigger one has had a bite on the smaller ones tail as you can see in the image. Or is this an illness? How should I care for something like this?

I think the bigger Axolotl has developed a fungus on his foot, the pic isn't overly good...I tested the water and ammonia and nitrites were the highest they have been so have done a partial water change and will continue to until the levels go down - we've only had the tank a couple weeks(we let it cycle a week before adding the axolotls) so from what I've read the levels will rise until the filter is fully established? Should I give him a salt bath?

Any help/advice is appreciated!! Don't want them getting sick!

Cheers

The tail damage will heal, the white part hanging off is the dead tissue, this will drop off eventually. The fungus on the foot is minor at the moment but keep an eye on it, you don't need salt baths for either yet.

Your tank is probably not cycled, which means your Axolotls are more susceptible to fungus and stress since your exposing them to Ammonia and Nitrites. Can you post the exact test results for your Ammonia, Nitrites, NitrAtes, and PH? Also, what is your water temperature? Can you post images of your tank?

Read these links to understand the Nitrogen Cycle:

Caudata Culture Articles - Cycling
Caudata Culture Articles - Water Quality

Your currently cycling your tank using your Axolotls as the source of Ammonia, which as I said before will cause stress and potentially fungus.