Hello and welcome to the forum BloomingOrchid!
First of all, expansions for orchids are awesome. I just got a new wire shelf rack for mine, and now I have room to expand.
Your phals that were in a community pot, were they seedlings or were they mature and just a very large pot? How old are they now? Depending on how young they are can change the culture requirements. If they are really young, then you will want a little higher humidity and moisture, but not stagnant air. Make sure there is some airflow. Pictures would be great!
As for the Vanda, I do not know, but there are a lot of very successful Vanda growers here than can advise.
Hope you enjoy your time on the forum.
jay