It's hard to say what has happened.  Some times when one or both parents destroy an egg....one or both may destroy any eggs there after.  There is just no way to tell until another batch is laid.  It could be they became aggressive after all the destruction and no matter who or what was there...they were going to attack.  There really is no way to tell unless someone was there to witness the whole scenario from the beginning.  You probably should separate the two for now.  I don't think I would attempt such a project as this again...at least not for a while. 

i just looked in on them, they seem fine now. i think  the hen destroyed the other 2 eggs. she didnt seem overly upset by the missing egss.

just by me sticking my hand in the cage.  thats when they got agressive.

they started their mating courting again.

the extra cage i have is quite a bit smaller than what either of them are used to. its in storage and i cant get to it untill tomm at the earliest.

gsees

Is it normal? I'm not sure. I know any bird in breeding mode can be aggressive, and most are to anything except their mate and eggs. Sometimes if the eggs are no good, they will destroy them. Sometimes not. I have a hen that is not mated and she'll set the eggs for over 3 weeks hoping they'll hatch I think, without cracking them. I think you should seperate them and leave them seperated unless you are fully prepared for babies.

I won't allow mine to raise babies if they don't have good temperments. I have never had an egg breaker or plucker in my cockatiels, but if I ever do, they will not be allowed to breed, they will be pets only. If I'm going to the effort & time of feeding properly, hand-feeding, taming, etc... I want to be as sure as I can that the babies are good birds that their new owners will be happy with. Just my opinion though.  

thanks,

thats good advice.

will one be ok in a smaller cage?

gsees

One of the reasons most breeders keep a closed aviary is because of egg breakage... or mate aggression...

The slightest upset and the pair can destroy eggs and worse still any chicks that may have hatched.

I never went near the nest box 'till the parents would leave to feed when I filled their troughs, but even then if I had a skittish pair I waited till they showed signs that they were through feeding the chicks and only then did I pull the babies...

Possibly it was feeling threatened that they broke the eggs... I have two male Amazons that are egg breakers and no amount of privacy changes that... they are over protective and make poor partners for  hens... 

My tiels are so used to commotion around here (like: my rowdy boys running in/out, Monkey, the schitzo cat having seizures, and Sarah, the yellow lab smacking her tail on the legs to the shelves the cages sit on, etc.) that I didn't even think about upset causing them to destroy the eggs. If they are used to peace and quiet, it wouldn't take a lot to upset them.

What sized are your cages gsees?