Getting skinny

[Franky]

Hello I'm new to the site and just ask about one of mine. I've got 3 axolotl and one is starting to get very skinny is this normally had them for around 5 years now.

 

[Kaini]

Well, what are you feeding them? How often? What is their setup like (size, substrate, water parameters etc) We'll need a little more information.