No I don't keep them together, however, they are next door neighbours in separate tanks....not sure whether letting them see each other or not is a good idea...
The 'breeder' said when they were young they were kept together, but Trevor used to try and muscle in on Xena's food. I think this may have something to do with her timidness and not eating properly...
This is why I am still unsure whether to reveal them to each other or not...
Right now the tanks are simply side by side but with paper towel between them.