My axolotl gibby was doing wonderfully until a couple months after i got him he went on a hunger strike. I got him to eat by switching up his food but in the process off him not eating his gills shrunk up and they never came back... as a matter of fact they’ve gotten smaller. i’ve also noticed him getting a bit pale and looking more white than pink like he used to be. i’m very concerned cause he seems uncomfortable. i do lots of water changes to see if the water is a problem. he eats an earthworm every other day and i just installed a water chiller for him so i don’t know what to do. Please help!