Choosing the Right Tank Size

Bigger Is Better

Larger tanks are easier to maintain than smaller ones. A larger volume of water dilutes waste more effectively, resists temperature swings, and gives you a bigger margin for error.

The Inch-Per-Gallon Myth

You may have heard "one inch of fish per gallon." This rule is misleading and outdated:

• A 30cm Oscar produces vastly more waste than 12 x 2.5cm neon tetras.
• Fish grow — that cute 5cm fish might reach 20cm.
• It ignores filtration, plant mass, and species temperament.

Instead, research each specific species and their minimum tank requirements.

Common Tank Sizes

Size	Weight (filled)	Suitable For
30 litres	~35 kg	Betta community, nano fish
60 litres	~70 kg	Small community (20-30 fish)
100 litres	~115 kg	Community with medium fish
200 litres	~230 kg	Larger community, African cichlids
300+ litres	350+ kg	Large cichlids, discus

Key Considerations

• Floor space vs height: Longer tanks are better than tall ones for most fish.
• Weight: Water weighs 1 kg per litre. Make sure your floor can support it.
• Stand: Always use a proper aquarium stand rated for the weight.
• Accessories budget: Filter, heater, lighting, substrate, test kit, water conditioner — the tank is only part of the cost.

Pro Tip: Start with a 60-litre (16 gallon) tank if you're unsure. Large enough to be stable, small enough to be affordable. Avoid tanks smaller than 30 litres — they're harder to keep stable, not easier.