[Gem930]

Can you tell the condition of the floor under the tanks?

It appears to be fine,  I have the fiberglass wedged up and have shop air blowing on it to dry it out.  Certainly surface rust in that area, but nowhere near the corrosion as under all the valves and filters that have likely vern leaking on and off for years.  There really was no good way to drain water out of there from leaks or even filter changes.