Gear guide

Best substrate for shrimp: cherry vs crystal

By the Shrimp Tank Hub editorsUpdated Oct 21, 2026Research-based

Research-based, not hands-on. We haven't tested these products ourselves. This guide compiles manufacturer-published specs and recurring owner reports (e.g. r/shrimptank, 2024–2026). Specs checked October 2026 and may change. How we research

The single biggest substrate decision is which shrimp you keep. Neocaridina (cherry, blue dream, and other color morphs) do well in neutral-to-slightly-hard water and are happy on almost any inert gravel or sand. Caridina (crystal red, crystal black, and other bee shrimp) are usually kept in soft, slightly acidic water, and most keepers use an active (buffering) aquasoil plus RO water to get there.

This guide compares published manufacturer claims and recurring owner reports. We haven't run these substrates side by side ourselves.

Substrate	Type	Effect on water	Best for	Owner-reported trade-offs
Inert gravel or sand (e.g. CaribSea Eco-Complete)	Inert	Little to none (check that it doesn't contain limestone or coral, which raise hardness)	Neocaridina	Lasts indefinitely; plants need root tabs.
Fluval Stratum	Volcanic soil, mild buffering	Maker says it "supports a neutral to slightly acidic pH" and reduces KH	Neocaridina, planted tanks; budget Caridina setups with care	Inexpensive and plant-friendly; owners often report the buffering fades within a few months.
ADA Aqua Soil Amazonia	Active aquasoil	Owners report pH roughly 6.0–6.8	Caridina	Strong reputation; expensive; leaches ammonia when new, so needs a full cycle.
Controsoil	Active aquasoil	Owners report pH around 6.2–6.6	Caridina on a budget	Cheaper than ADA; some keepers report buffering fading sooner.

Cherry shrimp (Neocaridina)

You don't need a special substrate. Most tap water that suits community fish will suit cherries. Active soils can actually work against them in soft tap water by pulling pH and KH lower than they prefer. Dark substrates are popular because owners find they show off red and blue colors better, but that's aesthetics, not health.

Crystal and bee shrimp (Caridina)

The usual recipe in the hobby is an active soil, RO or RO/DI water, and a GH-only remineralizer. Hard tap water with KH of a few degrees or more exhausts the soil's buffering much faster. Shrimp-focused references commonly cite 12–18 months of useful buffering from RO water, after which pH and KH drift up toward your source water and the soil needs replacing.

Key caveat: new active soils can leach ammonia for weeks. Fully cycle the tank and test before adding shrimp, especially with Amazonia.

Depth tip: 1–2 inches is typical for nano tanks. Avoid deep-vacuuming aquasoil, which breaks down the granules and shortens its life.

Our take

Keeping Neocaridina? Use an inert substrate you like the look of and spend the savings on plants. Keeping Caridina? An active soil is the norm. ADA Amazonia has the strongest long-term reputation, and Controsoil is the frequently suggested cheaper alternative. Fluval Stratum is a reasonable middle ground for planted tanks, but don't rely on it to hold low pH for long.

Sources: Fluval Stratum product pages; The Shrimp Guide, "Active substrates for Caridina explained"; The Planted Tank forum threads on Amazonia alternatives (2024–2026); owner reviews of Fluval Stratum. Specs and claims checked October 2026.