DJ somehow tells me he needs to get busy with toys, he likes to shred things. I keep buying him shredable toys, and he usually destroy them in minutes! It is expensive to keep a grey, and it's our responsibility to keep them happy and healthy. This is how i keep DJ happy and healthy:
The only times i lock him in his cage are when we sleep or when we go out (Spends most of his time on the play top)
He get's all the healthy food he can eat (As recommended by experienced members here)
I buy him 1 toy a week (Mostly shredables)
He gets to bathe twice a week and spend an hour or two in the sun right after
I spend at least an hour with him everyday (Mainly after i come home from work)
We exchange talk and sounds a lot during the day.
His cage is placed in the living room were we hang out most of the time.
He shares our food everyday, it makes him feel as part of the family.
We cover three sides of the cage when sleep time, as he likes to see what's happening.
We do not limit his movement at home, so it's fine when he leaves his cage and follow me around the house.
We understand that sometimes he wants to be left alone, so we give him some privacy.
We clean his cage once a day (Every morning after his breakfast)
He even watch TV with us
By doing all of the above, our loving CAG is busy most of his time and he doesn't have time for anything else. He is constantly busy and stimulated.