Best Aquarium Substrates For Planted And Decorative Tanks

These picks were shortlisted by product type and stated pack size, covering planting substrates, sand and gravel. Stock and buyer reviews change often, so check both on the product page before ordering.

Should I Choose Planting Substrate, Sand Or Gravel?

If live plants are the priority, start with a planting substrate, then compare sand and gravel by their stated use and appearance. Fluval names plants and shrimp in both Stratum options, while Seachem describes its black clay gravel as a planted aquarium substrate. That means gravel should not be ruled out just because you plan to add plants. For a white sand finish, Amtra offers fine quartz sand, while Marina lists decorative beach pebble gravel. Compare the intended uses side by side before looking at colour. These names do not establish suitability for every fish or shrimp, so check the full compatibility guidance for your planned inhabitants. Soil-based planting substrates such as Fluval Stratum tend to soften water and lower pH, which suits many shrimp and tetras but not hard-water fish like African cichlids. Bottom dwellers such as corydoras do best on sand or smooth, rounded gravel.

How Do These Aquarium Substrates Compare?

Each row pairs a substrate with the tank it suits and one listed detail, such as pack weight, volume or grain size. Work out the base area and the depth you want first, then check how many packs that needs.

How Much Aquarium Substrate Do I Need?

Work out the volume from your tank’s internal base length, width and intended substrate depth before you buy a pack. Measure all three in cm, multiply them together, then divide by 1,000 to estimate litres. For example, a base measuring 60 cm by 30 cm with a planned depth of 4 cm needs about 7.2 litres. This is an example calculation, not a depth recommendation for every setup. The listed Tetra Active packs contain 3 litres or 6 litres, while several alternatives are sold by kg. Do not treat kg as litres. For packs sold by weight, check the stated coverage or volume before comparing quantities.

How Should I Compare Substrate Colour And Grain Size?

Colour is about the look you want, whereas the stated grain measurements tell you how coarse the material is. The range includes white sand, brown planting substrate, black gravel and blue or multicolour decorative options. Marina’s natural beach pebble listing specifies black gravel with pieces measuring 1.2 to 1.8 cm, so the word natural does not mean beige. Hold a ruler against the tank base to picture that size before ordering. Amtra’s white quartz is described as fine sand. Where a grain measurement is missing, check it rather than assuming two gravels look alike. Colour alone does not confirm compatibility with your aquarium.

How Do You Prepare and Clean a New Substrate?

Most gravel and sand needs rinsing before it goes in, but planting soils often do not. Put plain gravel or sand in a clean bucket kept only for the aquarium, run tap water through it and stir by hand until the water runs almost clear, which removes the fine dust that would otherwise cloud the tank. Planting soils and active aquarium substrates are a different case: many makers say not to rinse them, because washing breaks down the granules and releases nutrients too early, so follow the instructions on the pack.

When filling, lay a plate or a clean plastic bag on the substrate and pour water gently onto it, so the layer is not washed into a crater. For ongoing care, a gravel vacuum lifts waste from gravel during regular partial water changes. Sand is better cleaned by hovering the vacuum just above the surface, and in planted areas a light pass is enough, since digging deep disturbs roots. Aquarium substrates are part of the tank’s biological filter, so avoid replacing the whole layer at once.

Next, see our guide to aquarium plants, then the aquarium cleaning kits guide.

Frequently Asked Questions

Last reviewed: 20 October 2026.