We used our boat over the weekend and I took several showers in the forward cabin. People used the galley heavily as well as the forward and aft heads. Yet... for some reason, the starboard water tank ran empty and the other two tanks (filled from the port side) were completely topped off, even after the long weekend. So, the only thing we DIDN'T use was the aft shower. So, how are these tanks still full? Is there some way to use use the full tanks when the galley tank runs out? Any advice is appreciated. I left without looking in the owner's manual. The plumbing schematic probably illustrates this. Thank you for any tips. Bernie