Illness/Sickness: Bloating axolotl

[PlushieDisease]

Hello I'm hoping that people have come across this before and can help me with my problem before he gets worse.

My axolotl was experiencing some weird stringy looking white stuff on his legs(reminds me of tree roots) and then bubbles showed up on his skin and for the last two weeks I've had him in a fridge I've started giving him salt water baths about 5 days ago, it seems to have helped a little but now he's starting to bloat. I have absolutely no idea what is going on. His tank mate showed no symptoms what so ever but he passed away unfortunately.

 

[AxolotlChris]

Do you test your tanks water for ammonia, nitrite, nitrate, and PH? How often did you give salt baths? And what guide did you use to perform these salt baths? We're the limbs damaged before the White stuff began appearing?