My degu fell ill 2 nights ago, i noticed he stopped running around the cage as much and was far less hyper than usual and was just lying about- and my other degu seemed to notice this and wouldnt leave his side. Unfortunately he has just died within the past 30minutes when i went to check on them before i went to bed. He was only about 6 months old and seemed to be fine previously quite shy around humans but very playful with his brother. during today and yesterday i was hand feeding him his favorite foods and even had to squeeze the water bottle for him because he seemed to weak to drink by himself. im not really sure why he died, he was well fed, always had fresh water in a steady climate and a clean environment. I'm concerned about the other degu now, they were very close and i dont want him to get lonely but i was previously advised not to introduce new degu's to old ones by a Pets-at-home expert as i wanted to buy some more. Should i just see how he goes?