I'm under the impression 3/4 tops out at 30" & to hold 3' you need 1". My 750 is 3/4" @ 30" tall and it bows a bit. I'd be weary of 3/4" thick for 3' tall.
Interesting subject. I just recently placed a deposit for an 96x48x33" tank 1" all around. It was suppose to be 36" but I shopped around a few local builders and all stated 36" tall at that size should at least be 1.25"- 1.5". The cost of that thickness was too much so decided to play it safe and went with 33" tall instead of 30" recommended at 1" thick. Needed the height for some large basses.
As a man who just had a tank pop with water all over the floor I wouldn't be looking to buy anything that is borderline acrylic thickness but that's just me
I'm not a huge fan of 30" tanks because you can reach in there. Considering that yours is already 4' deep, you're not going to be reaching the entire tank anyway, so I would say spend the dough and get the bigger tank for the larger water volume.
Possible, but it will most likely bow. I've seen 30" tall with 1/2" acrylic and it bowed terribly. It held for years, but definitely had an unsightly bow.
Well hes gonna call me back because he thinks he may be wrong on the thickness. We will see
