When I was having some troubles with my divider I put my naughty boy, Amadeus, in a large rectangular vase next to my pretty girl's tank. He flared at her constantly until I fixed the divider and moved him back into his tank. Now, my girl hides in her hut and when she does come out she has 'stress lines' and doesn't seem as happy...

I think she misses him because I see no other reason for her to be behaving like this. (unfortunately I can't say the same for Amadeus. He seems happy just to have his tank back)