I am getting 2 Jackson's females and i was wondering If I could house 2 in one enclosure. If so what size would it need to be?
I would strongly advise not housing them together. The male is going to terrorize the female constantly wanting to breed. Then she, not being able to get away is going to stress out and it can possibly lead to serious health problems. I have a male and female Jackson's which I free range (not together) and they have their own space across the room from each other where they can't get access to each other. This is the best advice I can give you. Separate cages is the way to go.
I think that primestick stated they had 2 females ... =)
Any ideas with a cage this big well planted? would they do ok with 2 females together?
Perhaps yes, but perhaps no. You'd have to try it and tell us. As I said though, I'd definitely have the capacity to separate them if needed if you do want to try housing them together.