Is this called fish tank lacing?

Judging from your picture, this is the strap of the fish tank.

That is, the upper and lower ends of the tank are tied together with glass strips in a rectangular frame along the inner wall of the tank, which is called lacing. The lacing of fish tank is mainly to strengthen the endurance of glass.

In order to prevent cylinder explosion, the upper and lower ends in the cylinder are bonded together along the rectangular frame surrounded by glass strips on the inner wall of the cylinder, so that the "bulging" force is "retracted" to increase the bonding area and strengthen the fish tank.