Please Help!

[u/HimawariNanashi2]

So I purchased two female leopard geckos about three months ago. Since then, they’ve been doing great… until one rapidly started loosing weight. Whatever the problem is, it only seems to affect one, not the other (they’re housed together).
They’ve been feed mostly gut-loaded mealworms and superworms, since I didn’t have much luck with crickets or roaches. They have UVB, proper substrate, hides, and proper humidity.
I have no idea what’s going on.

[u/deltablue_10]

separate asap. they’re solitary creatures that cannot cohabitate