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Sand and Quartz for Aquarium: the key element for a successful decor
Why choose sand or quartz for your aquarium?
In aquarium keeping, the choice of sand or quartz is essential . Much more than a simple decorative element, it influences the well-being of the fish, the development of the plants and the biological balance of the tank.
Sand plays several roles:
- Aesthetic , highlighting the colors of fish and plants.
- Organic , serving as a support for beneficial bacteria.
- Protective , especially for burrowing species that like to dig.
- Stabilizer , supplementing a nutrient soil and preventing it from dispersing in water.
Whether for a planted aquarium or a minimalist tank, choosing the right substrate is essential for a healthy and natural ecosystem.
How to choose the right aquarium sand?
Each aquarium has specific needs. Here are the main criteria to consider when selecting the ideal sand or quartz:
1. Granulometry: a key criterion
The size of the grains plays a determining role. Too fine, it prevents the circulation of water and promotes anoxic zones (lack of oxygen). Too large, it accumulates waste and harms the quality of the water. The ideal is a grain size between 0.5 and 2 mm .
2. Texture: suitable for bottom fish
Some fish, such as Corydoras and loaches, are constantly digging in the ground. For them, it is best to avoid sharp quartz and opt for Loire sand or natural sand with rounded grains.
3. Color: aesthetics and well-being of fish
The choice of color has an aesthetic but also behavioral importance. Shy fish prefer a dark soil that helps them feel safe. Conversely, a light soil will highlight colorful fish. Be careful, however, white sand gets dirty more quickly and requires more regular maintenance.
4. Composition: an impact on water
Some sands contain elements that can change water parameters. For example:
- Calcareous sands increase the pH and hardness of the water, ideal for African aquariums.
- Inert sands , such as Loire sand, are suitable for Amazonian or Asian biotopes.
If you are looking for a soil that influences water parameters, it is better to opt for a technical soil .
How much sand or quartz to use?
The ideal amount depends on the desired thickness and the size of the aquarium. For a planted aquarium, 5 to 7 cm of substrate is recommended, while an aquarium without plants will be sufficient with 3 to 5 cm .
A handy calculation tool allows you to accurately estimate the quantity needed based on the dimensions of the tank. Discover our guide dedicated to calculating the volume of sand .
Sand or quartz: which to choose?
- Loire sand : round grains, perfect for burrowing fish and natural aquariums.
- Natural quartz : aesthetic, stable, ideal for all types of aquariums.
- Colored quartz : decorative but be careful with certain dyes.
- Calcareous sand : modifies water parameters, to be reserved for specific aquariums.
Installing sand in the aquarium
- Rinse sand or quartz well before use to remove dust.
- Apply a uniform layer and adjust to the planting areas.
- Combine sand with nutrient soil for planted aquariums.
- Monitor water quality to avoid waste build-up.
One last tip for a top aquarium
Combining good substrate with lighting and a good CO2 system boosts plant growth and improves aquarium stability.