So I originally thought i only had like pepper cory cat fry but today when i put their food in I removed their little hidding/egg shuttle bush of HC and boom! like 20 little pepper cories!!
Don't be in a hurry to move them. Cory fry are delicate when they are young and the environment they are in obviously suits them. Give them another month or two before you even think about it.
Then it will depend on the temperament of the betta too.