He will only half come out of his shell and won’t eat. The temp is usually around 23C and it has a filter in it. If I poke him gently he will retreat back in to his shell but he won’t get up and crawl around.
Do a 50% for the time being, normally mysteries can handle 0.25ppm for a short while, but since something else seems to be up (could be old age) it's better to have as little as possiblePotato1 said:ammonia .25, nitrite 0, nitrate 0. The tank isn't cycled but I change the water every other day.