My leucistic axolotl is very ill. He hasn't been eating well for a long time and now his previously pink gills have gone a grey/blue colour. I think I can also see his arteries at the top of his head (little blue lines). He does eat a very small amount when I hold it in front of his face, but nothing close to what the others eat and he is very very skinny. Apart from that I can't really see anything else wrong from him. I have attached a picture of him compared to his golden albino Brother, they used to be exactly the same size as eachother....