We tested the fish tank after installing it in the greenhouse. It failed when the water was just beginning to drain. My son repaired the tear and erected concrete forms around the perimeter of the platform. Then he put the mended fish tank in place and began to slowly fill it with water, pouring concrete into the space between the form and the fish tank at the same rate as it filled with water. As a result, the outer concrete shell fits like a glove to the inner tank and there is no visible bulging or distortion from concrete or water. He stopped at 16" since the upper 1/3 of the tank receives far less pressure than the bottom 2/3.
This is a closeup of the interior, showing one of the tension rods and the 1" gluing strip along the bottom. So far the tank has proven to be sturdy and water-tight.
Here are pictures of the inside insulation of my greenhouse with the ends of the legs of the tables that will support my grow tanks. I daubed on silicone to form waterproof sleeves 2" up the legs.
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