What size is the set up? What size an weight are your snakes? A larger bio/tank/room helps. BUT it's best if BP's are housed separately. You'll have noodles cruising around instead of hiding.

Your not the first to house the wrong type of snakes together an you won't be the last. Your really lucky you didn't find hatchlings over the years.

Now, feed them both separate. I would use a large locking plastic tub. An wait hours after they are done before putting them back.

While many feed live, I don't as F/T is much safer. An cheaper for the most part.

20 years living with the same roommate? Your lucky they lasted that long!

If you want your snakes to last another 10 or so years? Make another set up for one of them.

Good luck!