I have a 180 gallon 60X24X30" the 30" is the tall part and it's 1/2" acrylic and it doesn’t bow.
Another factor is the length of the tank: I have a 8 foot tank that is also 30” high but it’s ¾” thick. I have a 6 foot tank that is 4 feet high and it’s 1” thick acrylic.
It will work...but for how long is the question...1" is required for 3ft heights. I have a 180 made from 1/2" that is 48x24x36" tall and it bows like a s.o.b. i cut holes in the overflow box to lower my water height a few inches because i dont really trust it. Alot of acrylic tanks out there are factory underbuilt and i find it odd. 1/2" will work if you dont mind bowing and it is extremly supported as in a wood build not a complete acrylic tank. Imo 3/4" is too flimsy for that height even.
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What happened to acrylic being 70 times stronger than glass. With a support around the edges, it might be ok
Just my opinion
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Just a thought...The 1/2" will work with a center brace or 2 in the middle and a few more inches around the diamater of the sheet. It will bow, but its very possible with a sturdy structure. It depends if you mind having a metal/wood bar down the middle of your viewing window. U.S. Plastics.com has pretty good prices, they were the deciding factor for me on
3/4". It was not much more than the 1/2". They even have 1" for under $1,000 which is alot cheaper than most places.
Wouldn't ever consider using 1/2 inch thick for a tank this tall. The stress on 1/2 material at that height will be servere. Liken 1/2 thick material at that height to filling a plastic bag full of water, this is what the bowing will look like. It will hold water but even with the additional bracing required will subject the material to all kinds of stresses and will cause some serious distortion. Tank longevity will be affected due to the additional stress imposed.