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If you do have a concrete floor the compresive strength (if it passed) would be a minimum of about 3000psi. The Tensile Strength is about 8%-12% of that. The shear strength of concrete is about 5% of the compressive strength. The correlation between compressive strength and flexural, tensile, torsional, and shear strength varies with concrete ingredients and environment. So basically concrete floors should handel pretty much any tank any of us would be putting on it. In any event please consult a Structual Engineer and refer to the structual plans and the test results before doing anything that would be more than the general use for that building. I will not and can not be held accountable for any damage that happens to any structure that anyone who reads this or hears about this information may cause.