Best Substrate for a Shrimp Tank

Start with the shrimp and source water

The best substrate is the one that supports water you can reproduce. Ask the breeder for the water conditions in which the shrimp were kept, test your source water, and decide whether the setup will use tap water or remineralized reverse-osmosis water before buying the bed.

Do not start from a slogan that all shrimp need acidic soil or that one species always belongs on inert gravel. Neocaridina and the different Caridina groups are kept under different water plans, and local breeder water can matter more than a generic chart.

The nano shrimp setup guide covers the complete handoff from breeder water, cycling, acclimation, and summer heat. Substrate is one component of that plan.

Fluval Stratum: choose it for its stated chemistry role

Fluval describes Stratum as volcanic soil designed to support neutral to slightly acidic pH and reduce carbonate hardness. Its support guidance explains that source-water buffering changes the result: low-KH water can become more acidic, while highly buffered water can remain alkaline.

That makes Stratum a candidate when the intended shrimp and source-water plan already points in that direction. It is not a shortcut for turning hard tap water into a precise Caridina target. Test pH, KH, GH, ammonia, and the parameters required by the actual livestock after the aquarium is assembled and cycled.

The bed is lightweight and supports rooted plants, but renewal belongs in the decision. Fluval gives a general replacement recommendation of every 1 to 2 years as nutrients deplete and the soil compacts, with timing dependent on the plants and use. Plan how livestock and hardscape will be moved before the substrate reaches the point where you want to replace it.

Eco-Planted: a planted mineral bed without the same stated buffer

CaribSea renamed Eco-Complete Planted to Eco-Planted. Its current substrate page describes a basaltic volcanic base with mineral content, porous grains, and live heterotrophic bacteria. The CaribSea FAQ says the name changed while the product numbers remained the same.

The current page does not make Fluval’s neutral-to-slightly-acidic or carbonate-hardness reduction claim. That makes Eco-Planted the clearer of these two when source water already matches the shrimp target and you do not want to build the setup around Stratum’s stated buffering function.

Do not translate “no matching buffering claim” into “guaranteed chemically inert.” Test the finished aquarium. Rocks, water changes, remineralizers, wood, and other materials can move the readings regardless of the bed.

Neocaridina decision

For a Neocaridina colony, begin with the breeder’s water and the source water available for regular changes. If the source is already stable and suitable, Eco-Planted or a documented plain sand or gravel may keep the setup simpler than adding a soil intended to lower KH.

Stratum can still be used when its effects are understood and compatible with the water plan. The product name “Plant and Shrimp” is not evidence that it is the best chemistry choice for every shrimp sold under a broad common name.

Caridina decision

Some soft-water Caridina setups deliberately use buffering soil together with remineralized water. Stratum’s documented direction can fit that system, but the soil is not the system by itself.

You still need:

• source water with a known starting composition
• an appropriate remineralization product and repeatable mixing method
• GH, KH, pH, ammonia, nitrite, nitrate, and temperature checks as required
• a completed nitrogen cycle and established grazing surfaces
• a renewal plan for the soil

Do not infer one target range for every Caridina variety. Use a species- and breeder-specific plan.

Planting and maintenance

Fluval currently recommends a gentle rinse in a large colander without agitating Stratum. It warns against cleaning it like gravel and against mixing it with non-soil substrates. Hover a small siphon above the surface rather than driving it into the granules.

CaribSea’s FAQ says Eco-Planted should not be rinsed. It permits mixing with other substrate up to its stated limit and gives separate advice for capping a new setup. Do not apply one product’s directions to the other.

Shrimplets can be difficult to see during deep substrate work. Make layout and renewal decisions before the colony is established, and use maintenance tools that let you see what is being removed.

Common mistakes

• Buying “shrimp soil” before choosing the shrimp and water source
• Trying to correct hard tap water with substrate alone
• Calling Eco-Planted chemically inactive despite CaribSea’s current description
• Treating Stratum’s replacement guidance as an exact expiry date
• Mixing or capping products whose manufacturers give different instructions
• Adding shrimp before the finished tank is cycled and tested
• Assuming dark color or fine grain proves chemical suitability

Final pick

Choose Fluval Stratum when its documented neutral-to-slightly-acidic and lower-KH direction is an intentional part of a tested soft-water plan and you accept eventual renewal.

Choose CaribSea Eco-Planted when the source water already matches the livestock target and you want a planted basaltic mineral bed without choosing Stratum’s explicit buffering role.

If neither chemistry path fits, use a documented plain sand or gravel and supply plant nutrition separately. The broader planted substrate guide compares that third path. For a direct read on the two featured bags, see Fluval Stratum vs Eco-Planted. The shrimp filter guide handles the powered-intake decision.