well a gallon of water weighs 8 lbs....the mass of a gallon of turtle should be the same. hes not made of led. ive had to help my roommate bust out pieces of glass from his tank. and i am comfident i could park a car in a 150 gallon and it would hold. if it would fit..evilxyardxgnome;1359001; said:I wouldn't do a tank, I believe they will get too heavy for glass full grown.