Illness/Sickness: I think my axolotl is sick

[MatDhyne]

Hello i have two juvenile axolotls and i think one of them is sick, He seems kinda sluggish but he still eats, I have a wild type which is gotten pretty big so far and is doing really well and the sick one is a golden albino. im a new owner to axolotls but i make sure i do 100% water changes on the golden albino because he is in a 10 gallon tank right now because he is still so small. I do daily ammonia checks and the other water tests to make sure everything is safe here are some pictures of him please help.

 

[Hayleyy]

I don't have a lot of experience with juveniles but it may just be it's personality. Some are more active where others don't do much. If it is still eating and parameters are good then I wouldn't worry unless there is change in eating habits or behaviour.