Glass tanks

[jrose]

I've noticed that my 2 tanks 29 and 40 gallon breeder both front and back glass bow about 1/8" the 29 is worse than the 40 is this normal? I've had people say yes and no a read both yes and no

[Kendall’s Aquarium]

My 40 gallon breeders both bow just slightly. One being over 10 years old

[nabokovfan87]

My 29G bows a ton.

Most tanks bow. The ones with center braces would bow a bit less. In terms of how the glass tanks are designed, that deflection reduces the stress. .125" is normal. More than that is..... Terrifying.

Be sure not to lean on the tank when full as hear you can if the bow is pretty severe and keep an eye on things like the top rim seal. A lot of the rims and braces will crack because they were leaned on when under load.