I'm worried!

[brie]

Hi I've never been on this forum before, but I have had my axolotl for 10months now and recently he has been very active, refusing to eat and now has some red veins appearing along the top of his back!
I've completely cleaned his tank, tried a change of food and even adjusted his water temp but nothing seems to work. Does anyone know what might be wrong with him?

 

[alex]

whats the temperature in the tank?. and whats the ph and ammonia levels?. axolotls are more active in warmer weather and might refuse to eat from heat stress.