Oliver Knott · Active aquasoil
Oliver Knott Nature Soil
Germany · Black to dark brown · grain 1 to 3 mm
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TL;DR, Oliver Knott Nature Soil
Oliver Knott Nature Soil is a designer aquasoil with a noticeably finer grain than most competitors. It is associated with European aquascaping competition entries because the small grain reads well in photographs and tucks neatly around hardscape detail.
Full specs
- Brand
- Oliver Knott
- Country of origin
- Germany
- Category
- Active aquasoil
- Colour
- Black to dark brown
- Grain size
- 1 to 3 mm
- pH target
- 6.2 to 6.8
- pH effect
- Lowers (gentle)
- KH effect
- Lowers (gentle)
- Ammonia release
- Light
- Nutrient content
- High
- Buffering longevity
- 12 to 18 months
- Recommended water
- Tap water tolerable, RO optional
- Difficulty
- 2 / 5
- Shrimp-safe
- Yes
- Best for
- aquascaping competitions, fine-grain detail work, rimless display tanks
How it works
Designed by German aquascaper Oliver Knott, the substrate is a baked clay aquasoil with grain selected to be finer and more uniform than most competitors. Buffering is mild, ammonia release is light, and the substrate holds shape underwater for over a year. The brand also sells a powder variant labelled Smart Soil.
Best use cases
Aquascaping competition entries where the substrate must read cleanly in photographs. Rimless display tanks where the fine grain elevates the scape's perceived quality. Also a popular choice for foreground carpets like Monte Carlo or HC Cuba because the fine grain holds runners well.
Common mistakes
Pouring the substrate from a height, the fine grain dusts the tank glass and takes a week to settle. Pour close to the substrate floor with a scoop.
Pro tips
Mix with Oliver Knott Substrate Conditioner during setup for an extra root nutrition boost. The pellets are slightly softer than Amazonia, so avoid heavy gravel-vac sessions.
Plants that thrive in this substrate
Hand-curated pairings based on the substrate category, not a relational query.
- Cryptocoryne WendtiiCryptocoryne wendtiiHeavy root feeder, thrives on the strong ammonia and nutrients leaching from new aquasoil.
- Amazon SwordEchinodorus grisebachiiBackground rosette with extensive root system, builds tall on the rich substrate.
- Rotala RotundifoliaRotala rotundifoliaStem plant that colours strongest under low pH + high nutrient soil conditions.
- Monte CarloMicranthemum tweedieiCarpeting plant that pearls quickly when rooted directly into aquasoil with CO2.
- Ludwigia 'Super Red'Ludwigia palustris 'Super Red'Reds deepen on active aquasoil thanks to the consistent micro-nutrient release.
Sources & further reading
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