They are adorable. Do you have them in the same enclosure? Rainbow is afraid of Cockatiels because they move to fast and scare him. Myrtle loves Cockatiels flying but she wants to be flight leader.
All the small birdies are in the same enclosure. I have a 'room' built separately for the gcc pair and lovebirds. The pair cannot get along with their offspring.
Kilaya ...cag Pipi, Zizi, Eclipse and Zico ... gcc
It looks like some sort of bamboo, Liz. And yes, all birds love celery (it's salty!). Try giving them dandelions and red Swiss Chard, they love those, too.