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Glass Fish Tanks: How to Choose Size and Thickness

A glass aquarium is the standard choice for home fish tanks: it stays clear, resists scratches and lasts for years. The right size depends on the fish you want and the space and stand you have.

Size and glass thickness

• Small (up to 60 cm, about 30-60 L): 5 mm glass; for guppies, bettas, small tetras.
• Medium (60-90 cm, 60-150 L): 6-8 mm glass; for community tanks.
• Large (120 cm+, 200 L+): 10 mm or more, usually with bracing; for oscars, flowerhorns and big catfish.

Bigger tanks are easier to keep stable: temperature and water quality change more slowly.

Glass vs acrylic vs plastic

Glass is cheaper than acrylic for the same size and scratches less. Acrylic is lighter and stronger but scratches easily. Plastic tanks and bowls are fine for temporary use or small fish; see plastic fish tanks.

Before you fill it

• Stand: level and strong; water weighs 1 kg per litre.
• Cycle the tank for 2-4 weeks with a filter running before adding most fish.
• Leak test on the floor for a day before setting it up.

FAQ

What size glass tank is best for beginners?
About 60 litres is a good start: big enough to stay stable, small enough to manage.

How thick should aquarium glass be?
As a rule of thumb, 5 mm for tanks up to 60 cm long, 6-8 mm up to 90 cm, and 10 mm or more for larger tanks.