I know the Yaherra used to be an experiment. I was gone for about 5 months and now it seems to be a pet? Are there elixirs that I can use for this kid? I have a chibi one but am very interested in having a few other iterations. What colors are available? I checked neocolours but those seem to be down at the moment. I apologize if I'm asking a dumb question but I love that experiment and am excited to see it have a name. Thank you for all your help.

Yes, it was part of a contest to vote on which experiment pet you wanted to become a real pet with more colors.

There aren't elixirs for it, but you can visit the Zapper to adopt a Yaherra for 500k, and then you can use a colored potion to change it to the color you want.

Subetalodge has a list of the colors it's currently available in: https://www.subetalodge.org/pets/species/Yaherra (also Nightmare, which is brand new and hasn't been added yet)

Awesome! Thank you so much!

From the news post (Sept 12):

Oops, I must have missed that bit. Good to know, thanks! :D

Oops...missed that, adding it right now :)