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Which grade of 1530 do you plan on using, full thickness, LS (Light Series), or UL (Ultra Light)? There are many calculators which you can google to aid in the design. Personal experience, I have 130 gallons supported on 36" length of 1.5" square solid extruded aluminum with no deflection. My best "guesstimate" would be (using full thickness) that as long as the longer width axis (of the horizontal spans) was in the vertical direction and the horizontal spans were supported on top of the vertical posts, I would think it would be more than sufficient. Again, just my best guess. Definitely run the math through a calculator for piece of mind.
Which grade of 1530 do you plan on using, full thickness, LS (Light Series), or UL (Ultra Light)? There are many calculators which you can google to aid in the design. Personal experience, I have 130 gallons supported on 36" length of 1.5" square solid extruded aluminum with no deflection. My best "guesstimate" would be (using full thickness) that as long as the longer width axis (of the horizontal spans) was in the vertical direction and the horizontal spans were supported on top of the vertical posts, I would think it would be more than sufficient. Again, just my best guess. Definitely run the math through a calculator for piece of mind.
I just noticed that you selected load fixed between two ...select far right tab supported on two ends.....
Anchor fasteners.
Thinking about adding two center braces along the 4 feet length so the span is only 12”. Still only 4 legs.
Looks Sharp I use this stuff at work and its solid if you use the right fastening HWD . You need to shore up the bottom corners with all that weight the bottom joints could fail
these are popular inside, below are outside flats I use and are rock solid. Still those legs look weak with 2k+lbs I would still go larger. Add the cost and thats why I mentioned a welded stand
@HolisticBear bought a stand engineered by a company, cut and shipped. to try to get away with no center support for a tank that large is gonna cost $$$ ether go with the 3x3 square all around or go with a welded aluminum.
Something like this?
One more thing to consider. In your calculations you used 1400 lbs, which is a fair number to estimate the weight. But you put the entire weight on one beam. I have a sneaky suspicion that your stand will have a front beam and a back beam. You might even have a couple of side beams in there too. Maybe even a solid top. This will help distribute the load. Rerunning the calculations for just two beams (700 lbs each) results in a defection of around one onehundreth of an inch, about the width of three human hairs. As mentioned above, just use good brackets and you will be fine. Good luck!