Your 12" I-Beams, is that a steel beam I-beam or just a wood beam? If it's an I-beam do you know the designation? Same question for the "load bearing beam". For example W12x40.
I don't like the way it sits, I guess you can't have the tank sit centered over the two "I-joists"? As it stands you may get a titer-totter effect.
I'm not a structural engineer and I don't have the full picture but your floor support looks really strange to me, does that pass inspection these days?
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