[Chris2500DK]

So I've just filled my 40 gal 32" by 19" 16" tall tank. It's made in 8 mm glas with no bracing. The weight of the water causes a very slight bowing in the middle of the tank, it's 1 mm wider than at the corners, is this something I should worry about?

 

[BillD]

No need to worry. I'm surprised you can measure a bow that slight.