Ultum Controsoil Freshwater Aqua Soil Substrate - Plant-Friendly Base

In this review the Ultum Controsoil freshwater aqua soil is examined for aquascapers and planted-tank keepers who want a nutrient-rich base that supports rapid plant growth. The main reason to buy is its formulation designed to buffer water to a slightly acidic pH and supply a low-ammonia volcanic ash substrate that encourages beneficial bacteria, making it an effective choice for fish, shrimp and live plant propagation.

Key Features

• Designed for planted aquariums: The granule composition and size distribution improve oxygen exchange and provide a structure that supports root penetration and healthy plant anchoring.
• Nutrient-rich volcanic ash: The black, fine particles deliver minerals and trace elements that help aquatic plants establish and grow quickly after planting.
• Low ammonia release: The substrate promotes and accelerates beneficial bacteria growth to keep initial ammonia less problematic for livestock.
• No rinsing required: The material is formulated to actively absorb impurities and reduce cloudy water, saving setup time for new tanks.
• pH and kH buffering: The substrate buffers water toward a slightly acidic pH and lowers total hardness to improve nutrient availability for plants.

Who It's For

The Ultum Controsoil is best for hobbyists setting up planted freshwater tanks with tropical fish and shrimp that prefer slightly acidic water and for aquascapers using hardscape like Dragon Stone who need a dark, fine-grained base to contrast plants. It suits growers who want a substrate that aids plant nutrition out of the bag.

People who need absolute crystal-clear first-day water or who require neutral to very hard water parameters should look elsewhere; while many users report clear water, some experienced mixed results with initial dust and temporary darkening, so very sensitive setups may prefer pre-washed or coarser substrates.

Pros & Cons

Pros

• Encourages fast plant growth by providing a nutrient-rich, oxygen-exchange friendly granule matrix.
• Supports shrimp and tropical fish by buffering toward slightly acidic pH and reducing total hardness.
• Low ammonia release helps establish biological filtration more predictably than plain gravels.
• No rinsing required in most cases, which speeds tank setup and helps absorb impurities.

Cons

• Some users report mixed results with water clarity and visible dust during initial fills in certain setups.
• Fine grain may require careful planting technique to avoid clouding when disturbed.

Specifications

Product name	Controsoil Freshwater Aqua Soil Substrate
Brand	Ultum Nature Systems
Granule size	Fine
Volume / weight	10 Liter | 20LB
Water chemistry	Buffers to slightly acidic pH; lowers kH
Composition	Volcanic ash based aquasoil
Rinsing	No rinsing required

Our Verdict

The Ultum Controsoil is a strong choice for planted aquarium enthusiasts who want a ready-to-use, nutrient-dense substrate that promotes plant growth and stabilizes slightly acidic conditions for fish and shrimp. It offers good value for aquascapers seeking a dark, fine volcanic ash base, though those needing flawless first-fill clarity should take care during setup.

Frequently Asked Questions

Is pre-rinsing necessary?
Most users do not need to rinse this aquasoil because it is formulated to absorb impurities, but delicate setups may opt for a quick, gentle rinse to reduce initial dust.

Will it change my tank pH?
Yes, the substrate is designed to buffer water toward a slightly acidic pH and lower total hardness, which benefits many aquatic plants and shrimp species.

Is it safe for shrimp and fish?
Yes; it is suitable for freshwater tropical fish and shrimp and supports beneficial bacteria growth while limiting ammonia release.