Planted Aquarium Substrates
The substrate anchors roots and, depending on the type, can supply nutrients and change water chemistry. It is also the hardest thing to change once the tank is planted, so it is worth choosing carefully.
What matters most
Aquasoil, inert gravel, or sand
Nutrient-rich aquasoils suit rooted plants and often soften water, but many release ammonia when new. Inert gravel and sand are stable and long-lasting; heavy root feeders in them usually need root tabs.
Think about your livestock
Bottom dwellers such as corydoras are often kept on smooth sand. Shrimp keepers frequently choose aquasoil for its effect on water chemistry. Check what your animals need before choosing.
Depth and slope
Rooted plants need enough depth to anchor; many aquascapers slope the substrate up toward the back to create depth. Buy enough to cover the footprint at your planned depth.
Check before you buy
- Which plants will be rooted in the substrate, and do they feed heavily through roots?
- Do your fish or shrimp need a particular grain size or water chemistry?
- Are you prepared to manage an initial ammonia release from new aquasoil?
- How much do you need for your footprint and depth?
You plan only epiphytes such as Anubias, Java fern, and mosses, which grow on wood and rock rather than in the substrate.
Ready to choose?
We have checked 10 substrates options for identity, specifications, and fit. Compare them, with what each needs and who should skip it, here:
Guides on this topic
Carpeting Plants for Planted Tanks
Common aquarium carpet plants grouped by difficulty, with the light, CO2, and substrate each needs, how densely to plant, and why carpets fail.
Easy Aquarium Plants for Beginners
Forgiving, widely available aquarium plants for a first tank, with placement, light needs, how to plant each one, and the mistakes that kill them.
How to Choose Aquarium Substrate for a Planted Tank
Aquasoil, inert gravel, or sand: how each affects plants, water chemistry, cycling, and livestock, plus depth, sloping, and how to estimate quantity.
The Dry Start Method for Carpeting Plants
How the dry start method grows a carpet before you flood the tank: setup steps, misting, mold prevention, timing, and flooding safely.