It does sound like your bp was a bit dehydrated. It also sounds like urates and not poo. Poo looks more like poo... brownish. You may want to consider taking a fecal sample to a vet to make sure the snake does not have internal parasites (which could be the reason for any runny poo).

Also you really should keep that one QT for at least 3 months, especially since it seems that the housing may have been less than adequate. If you do need to house the two animals in one tank I would recommend putting a divider in the cage to keep them separate. It would be better than putting any combination of your snakes together, even for a short period of time.