Hi! My axolotl hasn't eaten in the past three days and when I came home today his face was so swollen, his mouth isn't fully closed and on top of his head and under his throat is much large and swollen than usual, I did a water change, cleaned the bottom, cleaned the filter and put some plants in. He still isn't eating but he still hasn't improved either. His water is cool enough, also his face is red, and it's usually white.