Cockatiels get along very well with just a human also. They are very social birds and need interaction on daily bases. A LOT! LOL! I personally prefer to have two birds at a time so they can keep each other company when we are not at home. I don't know if Tiki will like the tiel right away, but she showed get used to her with time. Just don't put them in the same cage as they are of different species. Let then play together during playtime under supervision, especially during the first few months. Be careful in the beginning because Tiki might be jealous! Hopefully they'll get along well! Tikiya'smommy, try to get a handfed tiel if you are getting one, so it will be friendly, and hopefully, if Cheeko sees the new bird trusting you, he will trust you as well. We tamed Popcorn first when we got them. Muffin was a bit shy and very young (not even 3 months) but when she saw Popcorn being friendly, she decided all was safe and she became friendly too! Good luck both of you, and be sure to keep the birds safe from other pets!

Ps. $30 is EXTREMELY cheap for a tiel. Make sure you know of the breeder's sources, because sometimes a low price may not mean good. Be sure the birds are healthy, happy, active, and ask the breeder where she got their parents from. Its important to know when getting a bird. You don't want to support backyard breeders. If its indeed a good breeder, then what a price! I'd get 10 of them! They cost over $100 here!