Not really.
How wide is the tank?
How well do the fish get on already? Are they a pair or not?
What kind of filtration and w/c schedule?
Tank decor included?
The answer is no. But if you did, and provided the fish already get along fine, this would not exactly be a life threatening situation to the fish.
Please get a bigger tank. They can be got really cheap from classified ads, friends and family, asking nicely on this forum (I'm sure someone may loan you one - we are all here to help each other out) and if you can only get another tank the same size, keep the 2 jd's separately but with the tanks side by side.