I'm new to frog keeping so go easy on me

However...
These two little fellows have grown up together, they scrunch up together on the same branch or in the same corner of the enclosure, they sit in the water together (very occasionally) and essentially are practically inseparable. They are the same size, so cannibalism at this stage is unlikely. I have a very large tank, 100cms by 65cms. They are only the size of my thumb currently.
My question is, do I have to separate them? I have two tanks and am capable of doing so, I just feel like it would break their little froggy hearts to be separated...