most of us would say go without substrate, because of potential ingestion. do you have a fan in the room? plants really do help a lot. a big nice ficus might help.
this can help too
http://www.flchams.com/safe_plant_list.asp
My last little baby will be going to a new home shortly. I plan to stay in touch with the forum, hopefully I can get back into the hobby eventually.
Thanks friends for the wisdom and kind words.