going to be a long night tonight

[gregzz4]

Mold grows fast. When will you be able to check under the carpet?

When you do get around to moving the tank, you may want to rent a carpet blower to speed things up. I peeled the carpet back and ran the blower until the wood was dry. Then I layed the underlay over the fan for a day and another day with the fan between the underlay and carpet.

If you do have black mold, you should kill it right away. Use a mask and close the room off from the house. Open a window and let the furnace blow the air out, or some similar method. Use diluted rubbing alcohol in a sprayer and soak it gently so as not to get it airborne, then a scrub brush to remove it.
I've done this before and it works well.