Welcome. You will get this from a lot of people so let me be the first. BP's should not be housed in the same tank unless you are introducing them for short periods of time for the purpose of breeding. BP's are not group animals and having a tank mate does nothing but stress them out.
Also IMO if they are rescues and underweight from not being fed. Getting them back up to a healthy weight would be at the top of the list as well as getting them their own tanks with the proper heat and humidity.
Also I do want to point out. The only stupid question is the one not asked. So no need to say sorry everyone needs help and advice sometime and that what this place is for. If you have any questions feel free to ask them no matter how simple you think they may be.