Ultum Nature Systems Controsoil Aquasoil Substrate - Planted Tank Soil

In this review of Ultum Nature Systems Controsoil, the reviewer finds it best suited for hobbyists building planted freshwater aquaria who want an active, nutrient-rich base layer. The single biggest reason to buy is its formulation that buffers water to a slightly acidic pH while supplying a porous volcanic ash structure that encourages root development and beneficial bacteria growth. After setting up a test tank and planting common stem and carpet species, the reviewer noted robust early plant growth and a substrate that handled shrimp and small tropical fish without destabilizing water chemistry.

Key Features

• Designed for planted aquariums: Granule composition and sizes provide oxygen exchange and a stable rooting medium that benefits most aquatic plants.
• Optimal for fish and shrimp: The substrate supports slightly acidic water conditions preferred by many tropical fish and shrimp species.
• Low ammonia release: The product promotes and accelerates beneficial bacteria, reducing initial ammonia spikes during cycling.
• No rinsing required: The material actively absorbs impurities to help clarify cloudy water out of the bag without lengthy rinsing.
• pH and kH buffering: Controsoil lowers total water hardness and buffers to a slightly acidic pH for improved plant nutrient uptake.

Who It's For

This substrate is ideal for aquarists planning a planted freshwater layout who want an active soil that helps establish plants and a stable acidic environment. It suits users keeping live plants with shrimp or tropical fish that thrive in slightly acidic, softer water.

Less suitable are aquarists who need a completely neutral or hard-water substrate, or those who prefer inert sand or rock substrates for cichlid builds; customers requiring an ultra-fine play sand for bottom-dwelling fish may also look elsewhere.

Pros & Cons

Pros

• Encourages visible plant growth and rooting due to nutrient-rich volcanic ash granules.
• Buffers pH and lowers kH to create a favorable plant nutrient environment.
• Low ammonia release and support for beneficial bacteria reduce early cycling issues.
• No rinsing required makes setup quicker and reduces initial cloudiness in many cases.

Cons

• Water clarity and dust level are mixed in customer reports, so occasional initial cloudiness or sediment may appear depending on handling.
• Not ideal for aquarists who need a neutral, inert substrate or very coarse gravel for certain fish types.

Specifications

Our Verdict

Ultum Controsoil is a practical choice for planted aquarium hobbyists seeking a nutrient-dense, slightly acidic substrate that supports plant growth and shrimp-friendly water conditions. It offers good value for setups where softer, buffered water and active nutrient exchange matter, though those needing inert or very coarse substrates should consider alternatives.

Frequently Asked Questions

Will this substrate lower my aquarium pH?
Yes; Controsoil is formulated to buffer water to a slightly acidic pH and reduce total hardness over time.

Do I need to rinse the product before use?
No; the manufacturer states no rinsing is required and many users report minimal dust, though handling gently when pouring can help reduce any cloudiness.

Is this safe for shrimp and tropical fish?
Yes; it is suitable for freshwater shrimp and tropical fish that prefer slightly acidic water and benefits planted environments.