I would perfer 1/2" min. That's still a big tank 80gal...there is a lot of factors besides heigth....3/8th will work but most likely bow....go for the 1/2"...
1/2" walls and a 3/8th top and bottom are ok but the euro brace is gonna take the biggest hit....being that its already a small surface area and now your cutting the thickness down....its for sure gonna hold water with out a doubt...but bowing or deflection comes into play....I would use 1/2" all the way around.....but that's me.....with 1/2" material you have a lot of benefits
#1 your new to acrylic!!!! So this gives you more surface area for gluing/welding which =stronger joints...
#2 its not gonna bow down the road or cause problems for ya....
#3 looks...its gonna look a lot nicer in the fashion of not bowing.....and thick acrylic looks cool....
If you are "sandwiching" the sides between the top and bottom, the gluing surface area won't change at all, it will be the same as if you used 1/2" or even 2" for the top and bottom, still 1/2" material being glued down.
I do agree though, using thicker material helps me sleep better at night
Personally, I'd use all 1/2" and a 3" eurobrace all around, yielding one top opening measuring 34 x 24".
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