Separating them immediately is going to be the best thing you can do each of them.
If you go to the nearest hardware shop, look for 100L - 140L see through sided plastic tubs (with lids, clip on lids (the handles act as clips) and wheels under them, the type that can stacked and are built STRONG for storage. They are pretty cheap.
100L to 140L stackable tubs will do each of them for their first 12 months. Real easy to convert these stackable tubs to rearing tubs. PM me if you want to know how , economical and if you don't mind the tubs next to each other on the floor (side by side) or a big enough bench or table , you only need one 10%-14% UVB T5 tube and fitting and one basking light to do both tubs.
This way you will have several months to save for two full sized fully equipped tanks .