Self-Sustaining Planted Aquariums
A dirted, low-tech tank runs on soil, plants, and light with no filter and no CO2. It clouds for a week, then clears on its own and holds for years. These are the guides to building one, from a 2-gallon jar to a 40-gallon.
All 16 guides
Capping Soil With Sand: How Deep, and Why
Cap depth is the difference between a tank that clears in a week and one that leaks mud for a month. One inch of sand over the soil is the number, and here is why.
Dirted Tank vs Aquasoil: Which Substrate Is Right for You
A dirted 10-gallon costs about the price of a bag of topsoil, and an aquasoil tank of the same size costs several times that. Both grow plants; they solve different problems.
Floating Plants for Low-Tech Tanks: The Best Nutrient Sponges
A mat of floating plants is the cheapest nitrate export a low-tech tank can add. They feed on air, grow fast, and shade the algae that surplus nutrients would otherwise feed.
How to Build a Self-Sustaining Shrimp Tank
A shrimp colony is the closest thing to a tank that feeds itself, because the shrimp eat what the tank produces. The catch is the water: get the minerals wrong and the colony cannot molt.
How to Set Up a Low-Tech Planted Tank
A low-tech planted tank skips the CO2 and the pressurized gear and still grows a full scape, just slower. Here is the build, the plant list, and what to stock.
How to Set Up a Walstad Tank: Soil, Sand, and No Filter
A dirted tank clouds for about a week, then clears on its own once the bacteria catch up. The soil under the sand does the filter's job for free. Here is how to build one.
The Best Low-Light Aquarium Plants for a No-CO2 Tank
Low light is not a limit on what you can grow, only on which plants. These are the ones that never wanted strong light or CO2 in the first place.
The Best Plants for a Walstad Tank (and Why They Work)
The best plants for a Walstad tank are the ones that grow fast and eat ammonia hard in the first month. Here are the ones that hold under low light, and why.
The Best Soil for a Planted Aquarium (Dirted Tank Substrate)
The best soil for a dirted tank is the cheapest plain organic topsoil with nothing added. The fertilized, premium bags are the ones that spike ammonia. Here is how to choose.
The Cheapest Way to Start a Planted Tank
The cheapest planted tank is not the one with the cheapest gear. It is the dirted 10-gallon that needs almost no gear: topsoil, sand, a shop light, and fast plants.
The Common Walstad Tank Mistakes (and How to Avoid Them)
A Walstad tank almost never fails because the method is wrong. It fails from five or six specific, avoidable mistakes: thin planting, the wrong soil, and stocking too early.
The El Natural Aquarium: Diana Walstad's Original Idea
El Natural is the hobby's name for Diana Walstad's low-tech, soil-based tank. The plants and the dirt do the filter's job, and the balance comes from biology, not gear.
The No-Filter Aquarium: What It Takes to Run One
A no-filter tank is not a tank with the filter removed. It is a tank where the plants and substrate do the filter's biological work, which only holds if you build for it.
The Walstad Jar: A No-Filter Ecosystem on a Desk
A wide-mouth jar of soil, plants, and shrimp runs with no filter and no heater on a desk. It is the smallest honest Walstad build, and the least forgiving.
The Walstad Method, Explained: How a Tank Runs on Dirt
A Walstad tank has no filter and no CO2, yet it runs clear for years on a bag of soil. The soil feeds the plants and the plants do the filtering. Here is why that works.
Walstad Tank Lighting: How Much, and For How Long
Give a dirted tank 6 to 8 hours of light a day, not the 10 or 12 a high-tech scape runs. In a low-tech tank, extra light feeds algae, not plants.
From the compatibility database
Parameters pulled live from the compatibility database.
- Light: low · beginner
- Temp 68 to 82 F · pH 6 to 7.5
- Hardness 3 to 15 dGH · CO2 none
- Light: low · beginner
- Temp 72 to 82 F · pH 6 to 7.5
- Hardness 2 to 15 dGH · CO2 none
- Light: low · beginner
- Temp 59 to 86 F · pH 6 to 7.5
- Hardness 5 to 15 dGH · CO2 none
- shrimp · peaceful · beginner
- Temp 65 to 78 F · pH 6.5 to 8
- Min 5 gal · adult 1.2 in
- nutrient base layer for a dirted / Walstad tank
- substrate · $
- light for a small low-tech tank
- light · $
One build breakdown a week.
A stocked, balanced setup pulled apart: the plants, the cleanup crew, the parameters, and where it would go wrong. Free.
No spam. Unsubscribe anytime.