[rockman]

Thanks for all the help guys but turns out I was being a bit of a pillock. I DID indeed move a population of methane breathers onto my oxygen planet and hence planet became domed and I lost the use of the extra facilities - bad move. Now I will have to move them off again. When I load my transport do i get the choice of which kind of population i want to move ie oxygen breathers or methane breathers? Or do I just have to move the whole lot.

Sorry about my misleading answers - thanks for the help from all of you!