My Fish House

This is my 5th fish house construction job. I intend to put photos online in various stages of construction. This may help others in constructing a fish house. My mistakes in earlier constructions are refined in this construction.
I have omitted the mixing of 10 tons of concrete by hand & a steel reinforced mesh. This is placed over 10 tons of hard core. A solid base is of paramount importance before construction as the weight of tanks, frames & water can be considerable.
Rule #1 Make sure the base is strong enough.