Start with the water, not the menu
An axolotl lives in constant contact with its water through skin and feathery external gills, so water quality reaches it faster and harder than it reaches a fish. Even low levels of ammonia or nitrite irritate the gills and suppress appetite, often before any visible damage appears. Temperature matters just as much: axolotls are cold-water animals that do best in the low to mid 60s Fahrenheit, and water creeping toward or past the high 60s speeds their metabolism, lowers the oxygen the water holds and stresses them off food. Before you buy a different worm, test ammonia, nitrite and nitrate and read the thermometer. In most home tanks, one of those numbers explains the hunger strike.
Other reasons an axolotl turns away
If the water tests clean and cool, look at what changed. A recent move, a rearranged tank or new tankmates can put an axolotl off food for days while it relearns its surroundings. Bright light with no cave or plant cover to retreat into does the same. Gravel small enough to swallow is a mechanical risk: axolotls feed by sudden suction and can gulp substrate with the worm, and a belly full of gravel stops appetite and digestion. Early illness also starts quietly, so look for gills that look smaller or paler than usual, white fuzzy patches on the gills, skin redness, or floating at the surface that the axolotl seems unable to control.
Coaxing the appetite back
Fix the water first: a partial water change with dechlorinated water matched for temperature, and cooling if the tank runs warm, using a fan across the surface or a chiller where summers are hot. Then offer food the way an axolotl likes to meet it: lights low, movement gentle, a piece of earthworm or a soft pellet held on tongs just in front of the nose and wiggled slightly. Evening suits their natural rhythm. Offer smaller pieces than usual, give the axolotl a full minute to decide, and remove anything uneaten so it does not foul the water you just cleaned. Most stress and water-related refusals end within a few days of conditions being right.
When refusal stops being a phase
A healthy adult can skip several days without concern, but a juvenile should eat far more often, and any refusal paired with other signs deserves help. Contact an aquatic or exotics vet if an adult refuses for around a week despite correct water, if a juvenile refuses for more than a couple of days, or if you see gills curling forward, shrinking gill stalks, white patches, persistent floating, a swollen belly or steady weight loss. Take your test results and a note of what foods were offered and refused, because that history narrows the vet's search considerably.
Keeping the record that makes patterns visible
Axolotl appetites rise and fall with seasons and tank conditions, and one missed meal means little on its own. What matters is the trace: water readings, temperatures, what was offered and what was taken, week by week. Keeping those notes together in your axolotl's Pet Passport on KinsLe means that if a refusal ever does turn into a vet visit, you arrive with the timeline already written instead of trying to remember when the water last tested clean.