So the pet store down the street from me pretty consistently has axolotls, the past few months ive seen one in there with a giant lump on his head ...they have the tank around 75-80 degrees so i finally had to save the little guy wondering if its an infection or what/ what can be done for him. I have little backround on this guy although i know the water conditions beside the temperature are well and they have a diet of exclusively tilapia and let me tell you these guys are massive quite unbelievable actually never seen any as big as some in that tank.