In Minecraft, axolotls only eat buckets filled with tropical fish, which you can't get by just killing or catching random fish.

Axolotls can be bred just like other mobs in Minecraft, but they are a bit picky about what they will and will not eat for breeding purposes.

How to get a Happy Ghast in Minecraft A ghastling will naturally turn into a Happy Ghast after another 20 minutes have passed, but you can speed up this process by feeding it snowballs.