Are you talking to me when you are asking if my building is made of concrete? If you are, you can be the judge. From what I see, the walls are made of cinder blocks and the ceiling/floors are made up of concrete.
I should be worried or should not?
Based on the photos, do you think the garage floor is reinforced concrete? Anyone? I have no experience in construction but based on the photos of the garage ceiling, they are concrete right? (Yes) Correct me if I'm wrong but I don't think there's a way to construct a ceiling/floor that has concrete on the bottom side and wood on the top part. I think the garage ceiling is definitely reinforced concrete (unless there is another way to construct it) and from what the other more informed member says, has a lot of strength and can support a lot of weight, way more than what a 950 pound tank would be.
Tank would be bare bottom with driftwood. By the way, how do I find out if there is concrete support beams in my floor? Should a stud finder be able to find it?