I suggest get to work on preparing for an emergency move. Have a place ready for everything because it can go from bad to worse quickly. Get some rubbermades and some heaters and powerheads and start making up some water. Then as Flower suggested dry everything off. If you can't see it coming from above, or the sides, it is most likely from the bottom. Make sure you don't have any hob filters or skimmers or anything else causing the wet spot.