wow coincidence, i was chatting to a freind at my allotment who was telling me about his dads freind in indonesia who gets a guy in to clean his marine tank, after talking about it he mentioned a swimsuit and kit, i thought a bit excessive to clean a tank? so i asked him he replied... ''no he gets a guy in the tank to clean it'' lol he goes on to tell me its a dividing wall and he gets the guy literally in to clean it, how i wish i was the owner, he also told me how he had built a swimming pool for his dog so i think the owners is rich or just nuts, or possibly both.