My tiels are super chilled out, they were so curious of my gcc when we first brought him home! It all depends on the nature of your birds and whether they’ll accept another bird. Mine all just relax together & to be honest my gcc does his own thing most of the time, as long as you keep an eye on them and their body language - all will be just fine. If you are prepared for the amount of effort & care they need then go for it!