Glass or acrylic: which material should you choose for your aquarium?
For most beginners, glass remains the best choice: cheaper, more rigid and scratch-resistant. Acrylic really shines on very large volumes or complex shapes, where its light weight and superior clarity become a genuine advantage despite a higher price.
What are the differences in weight and strength?
A glass aquarium weighs noticeably more at equal volume, worth checking before choosing a suitable stand. In exchange, it resists frontal impacts very well and almost never scratches from a net or a magnetic cleaner, unlike acrylic which marks at the slightest contact.
What about clarity and how fish look through it?
- Glass: a slight greenish tint on thick panes, mostly visible on very large tanks.
- Acrylic: near-perfect clarity and minimal optical distortion, much appreciated in aquascaping and reef tanks.
- Weight: acrylic weighs roughly half as much, a real advantage for curved shapes or very large volumes.
- Budget: at equal volume, acrylic often costs 30 to 60% more than glass.
Which material for which use?
For a first standard tank up to 200-300 litres, glass is almost always the right call: cheaper, simpler to maintain and widely available in ready-to-go kits. Acrylic becomes relevant beyond that, or for unusual shapes (cylinders, curved corners) that glass can't produce without a real risk of fragility.
Does maintenance differ by material?
On acrylic, never use a metal scraper or abrasive sponge: even a micro-scratch permanently dulls the pane and becomes a magnet for algae that's hard to clean off. Glass tolerates far more tool types, including common maintenance gear found in stores.
Frequently asked questions
Does acrylic really scratch more easily than glass?
Yes, its surface is noticeably softer: a poorly chosen magnetic cleaner or a trapped grain of sand is enough to leave a visible mark, whereas glass is nearly immune to this.
Can a scratched or cracked pane be repaired?
An acrylic scratch can sometimes be buffed out with specialist products, but a crack in either glass or acrylic means replacing the tank: never risk refilling it.
Does the price justify acrylic for a beginner?
Rarely: for a first aquarium, glass offers the best strength-to-price ratio, with acrylic mostly worth it for ambitious projects or non-standard shapes.
This guide is part of Planète Pets’s Fishkeeping universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.