As far as finding the direction of the floor joists in the area you want the tank try this......Go to the closest floor heating/AC register, take the grill/insert out and look to see which direction the duct comes from.......if it either runs left or right that is the direction your floor joists will be running parallel with the wall, if the duct runs back towards the middle of the room the joist will be perpidicular to the wall.
May not be 100% full proof but close.
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