Sky (Male) and Clover (Female) successfully reared 4 chicks, I removed Clover when the chicks left the nesting box to stop them from breeding again. Now I have returned Sky back to the aviary with the flock and unfortunately looks like Clover an a couple the other budgies are not happy to see him. They are chasing him around the aviary:( Can anyone give me any insight on this behaviour. They all got on well before I removed the pair to breed.

Are they still attacking him? If they are I would suggest removing him to avoid any injuries. Budgies can be quiet aggressive when they want to be, keep an eye on them and if they aren't fighting leave them but if they become aggressive again I would remove the male