The 40 year old tank I am consiering is housed in a bamboo frame and not able to be removed out of the main frame. The seller stated his parents kept freshwater fish in it for many years and about 12 years ago, his son kept saltwater. I love the frame of the tank, it's bamboo from the Philippines, but it's 40 years old. Thoughts on what I should look for when looking at this tank? Also, can old tanks be refurbished if it is indeed leaking when I fill it? It also has a large bamboo roof on the tank as well. I've owned new saltwater tanks in the past, but do not know what to look for as far as integrity in old tanks. Advice?