Amazon Milk Frog Illness?

[Repguy27]

I recently got an Amazom Milk Frog (Quazzi) as a companion for my Red Eye Tree Frog (Brian). They are in a 12x12x18 tank and I have yet to see them interact as Quazzi is active when its light out and Brian is active only when it's dark. Today I just noticed that Quazzi has what looks like a blue gel coming from his backside. It stays there and doesn't fall off. What is it?

 

[Aplestris]

Hi
I admit I do not know what it is but I would definitely move the Milk Frog to another tank, it may be caused by being in the same place as the red eyed tree frog. If it is an illness/disease, it is probably best to remove Quazzi anyway
I hope it gets better