Cockatiel Needs

Cage

Square, rectangular is better, straight sides with no bevel to the bottom (birds can make them messy), 18x18x24H is suggested. The bars should be no farther apart than 3/4", and it is helpful if at least one wall of the cage is constructed of horizontal bars, to make it easy for the bird to climb around- Keep the cage out of direct sunlight, unless it is large enough for the bird to get away from the sun. They can overheat easily during the summer

Perches:

Use varying widths. This is important to exercise their feet. You can use different kinds of branches. Avoid having perches located directly over food containers.. Offer occasional opportunity for protected outdoor exposure to fresh air, sunlight and exercise.

Toys:

Bells and hanging jangles are not as good as a swing, and might even be dangerous with open wire connections. Cockatiels would rather nibble on paper and soft wood strips, eat rungs out of ladders, etc - but be careful; a cage with too many toys can be hazardous to the bird's safety. Put as many bird-safe toys in the cage without cluttering, to provide mental and physical stimulation. Offer purchased toys or such homemade toys as rawhide, empty paper rolls, or clothespins without the spring

Food:

A good cockatiel seed mix is OK. Sunflower seed is fattening. A complete vitamin pellet is best mixed in gradually with seed to convert them, or placed in the favourite eating spot. Apple slices, greens such as kale, collards, broccoli, cut strips of beans and millet sprays clipped between the wires are good. Canned kernel type corn is a special favourite and a spray of millet is always pounced on with joy.

Water dishes should contain clean, fresh water and be changed every day and should be free from droppings and food. One of the bottle type water dispensers may be better as it prevents water contamination better.