Your degu is adorable and looks like a lot of fun. But I have to agree with Cassi, I really think it is a bad idea to keep them caged together. They are not the same species, and even though they do get along, that could instantly change. If it were me, I would want to play it safe and separate them asap, and enjoy them individually, before something terrible happens. You don't want to look back someday realizing you could have prevented this.
If I am totally wrong, I apologize, but instinct tells me that they should be housed separately.