Assuming you have watered regulary its likely suffering from root rot.
I would recomend removing it from the pot to inspect the roots
If they are rotten cut them off and then plant it in new dry cactus soil. Don't water for a while but mist it heavily every day.
Hope this helps.
Assuming you have watered regulary its likely suffering from root rot. I would recomend removing it from the pot to inspect the roots If they are rotten cut them off and then plant it in new dry cactus soil. Don't water for a while but mist it heavily every day. Hope this helps.