I inspected the hoses and connections on the heat exchanger side of the tank, connections were tight and dry, hose clamps were tight. There isn't anything else around the tank, it sits on a shelf of sorts, behind a panel behind the Q-berth. The antifreeze is coming from the front/bottom which is pretty rusty. I can't think of any other scenario that would result in a puddle of green anti freeze? Also, the surveyor cautioned us that the tank didn't look so good and that I should monitor it. However, all that said I am by no means the hot water tank expert here.