Basically my Axolotl, Goldie is not there when i returned onto my realm server

This all happened in my realm server.. i rescued Goldie the axolotl two days ago from a group of Drowned he was fighting. And i named him, with a name tag, so that he wouldn't despawn in the pond area i made for him, all while doing so i was looking for a friend for him. I came back today and he's gone no trace of him anywhere.. can you fix this issue?  I dont have a picture of him..but i can give a picture of the pond! Thank you!
-ShadowDrag0n768