Like many here i say you got to seperate these two. Even though they coexist they probibly feel safer together i.e. safety in numbers. But even a rubbermaid or sterilite tub will be better then keeping them together. They follow eachother to the hide because they feel safe. Thats an awfully big tank. Try putting some foliage on the ground like vines or something that way they can slip from hide to hide unnoticed..

Thats all from me. Welcome to the forum.