Not to start a debate but I think I need to state a few things to prevent other readers from developing false concern regarding there tanks being improperly supported.
The support post is 100% not required, the advice given by your engineering friend may be partially accurate if the tank weight 10X what it does, but it doesn't. 1200lbs over two beams is not substantial, especially when the load is so close to not only the main engineered support beam but also the support posts underneath of it. You also have 3/4" hardwood that will run perpendicular to the joists adding substantial strength and stiffness to your floor. Our floors are already designed for both dead load and live load. 1200lbs is no where near the limit for dead load and additional live load wouldn't be affected. Lateral twisting would require a huge load off center to create a torsion moment, realistically it's not possible which is why no beams are ever connected from below. Also support posts should installed on piles to prevent movement, from an engineering point the post is doing more harm than good but realistically it's not doing anything close to worth it's value in steel.
Just want people to know the full story and not be mislead thinking they need to add support posts under there tanks. Everything else looks awesome.
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