I have a question. My ex and I share joint custody of my daughter. My ex and her boyfriend are going to move out. She told me that her, her boyfriend and my 2 year old daughter would be sharing a room. I feel that this is wrong and is there anything I can do ?

Nope, at this age a court is not likely to do anything about it.

Why do you feel it is wrong ? Sorry being poor and not being able to afford larger houses are not a crime.

It has nothing to do with that. I guess it's the fact that my daughter is seeing her mother and a different man in the same bed.

... I guess its the fact that my daughter is seeing her mother and a different man in the same bed.

This attitude on your part is logically flawed.

Her mother is your ex-wife? Or ex-girlfriend? In either case, why should your daughter have reason to expect your ex to sleep with no one but you? And if she was never married to you, it would have been equally as unseemly for your daughter to knew that she shared a bed with you.

Agree, couples divorce, separate, and kids need to grow up knowing that their parents have and are in loving relationships. Sorry, this sounds more you are not happy your ex is with someone else, and wanting to try to find way to make her come back by threateing her with the child.
Sorry if I read too much into this

No, I couldn't care less who my ex is with.