I just got a used tank. The gravel in the bottom of the bucket was still wet. Everything else was dry so I'm guessing it had been torn down at least a couple of days ago. Is it possible there is still live beneficial bacteria on the gravel and would it be good to set it up as fast as possible to get a head start on cycling? There is no telling how long it sat. I guess it could have sat for quite a while and still been wet at the bottom.