Why Are Glass Aquariums So Expensive?: "Tempered (toughened) is glass that was melted and cooled quickly, resulting in stronger glass that can hold more gallons. The downside to this glass is if it ever cracks, it shatters, so no drilling. This glass is vulnerable at the edges, but otherwise it holds up well for larger tanks.
Plate glass (flat glass, sheet glass) cannot hold as much water, but it certainly suffices for the smaller aquariums. This material can be drilled and cracked without shattering.
Tempered glass is more expensive than plate glass, and so that is why bigger aquariums jump in price; they're made of the strong stuff, tempered.
Some small aquariums are not even made of glass, like a typical 5 gallon fish tank can be made of cheap plastic, resulting in an even cheaper alternative. And then there is a plastic called Acrylic that is stronger than tempered glass and way more expensive too."
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