150x40x40 glass thickness

[castle]

Does anyone have a trusted source to calculate glass deflection?

Wanting to order a new aquarium, but I don’t want to notice any bend in the glass 😅🤷‍♂️

My calculation is about 0.2mm in 12mm glass but, I could go 15mm if it means I sleep easier…

 

[Atragene]

I have slept quite happily with a 150x60 x60 above my head for many years. Make sure of a suitably firm and true base with 12 mm glass