Bacteria, snails, and tiny creatures for a self-sufficient low-tech fish tank

In a low tech aquarium, it’s not the filter that works. It’s actually billions of invisible workers: microbes, microfauna, snails, shrimp… a whole natural maintenance is at work.
Together, they form a complete food and biological chain that ensures biodiversity and the water balance almost without human intervention.
Just like in nature...

It’s the foundation of a truly self-sufficient aquarium, where biology largely takes over from technology.

👉 Also read:
The nitrogen cycle made easy → https://aquazolla.com/blogs/news/le-cycle-de-l-azote-sans-efforts

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Microfauna: the invisible filter feeders (Daphnia, Ostracods...)

 

 

You can hardly see them… but without them, it’s hard to get crystal clear water.
While a filter is powerless against green water, for example, daphnia and ostracods know how to eat the suspended algae that compose it. That's the advantage of low-tech!
The Daphnia, ostracods and other microorganisms form a permanent zooplankton that purifies the water by filtering bacteria, particles, and microscopic algae: a true living biological filtration.

They also serve as live food for fish and shrimp, stimulating their natural hunting and providing incomparable enrichment.

🔗 Product:
Daphnia (Live strain) → https://aquazolla.com/products/daphnies
The tireless filterers.

 

🔗 Article:
Daphnia: little-known facts and recent discoveries
→ https://aquazolla.com/blogs/news/daphnies-faits-meconnus-decouvertes

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Water lice: the queens of aquatic composting

 

 

Water lice are the detritivores par excellence: everything that falls to the ground, they recycle it.
Organic waste, dead leaves, micro food remains... they transform everything into nutrients for plants.

They effectively replace soil siphoning: no waste accumulates, everything is recycled.
They are also the only ones to eat what even shrimp ignore.

Asellus aquaticus is the equivalent of your compost worms and garden woodlice... but underwater.

🔗 Product:
Water lice (Asellus aquaticus) → https://aquazolla.com/products/aselles
An essential for low tech.

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Snails: indicators and gardeners (ramshorn snails, malaysian Trumpet Snail)

 

 

Snails have a bad reputation, even though they are among the best allies of a low tech tank.
The Ramshorn snails eliminate glass algae and micro-deposits. The Malaysian Trumpet Snail, on the other hand, burrow into the soil and ensure perfect soil aeration.

They never consume healthy plants: they prefer debris and excess.
They are also true bio-indicators: if they proliferate, it means there is too much food. Their population regulates itself naturally.

 

🔗 Article:
Snails: why are they so indispensable?
→ https://aquazolla.com/blogs/news/escargots-nbsp-pourquoi-sont-ils-si-indispensables-nbsp

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Bacteria and other microbes: no life without them

Bacteria are everywhere. In the soil, on the glass, rocks, and leaves, and even suspended in the water!
They form the biofilm, that slightly slippery layer that forms everywhere underwater.

That is why the filter is not essential. Bacteria, in natural or low-tech aquariums just like in nature, know very well how to work without it.
All biological cycles rely on bacteria, amoebas, various viruses, aquatic fungi, and protozoa. A sterile aquarium is a dead aquarium, subject to all imbalances.

Microbial biodiversity is the secret of natural and low-tech aquariums. It ensures biological cycles, stability, resilience of the aquarium, but also the comfort and health of fish and shrimp.

 

🔗 Product:
Zollabox Start → https://aquazolla.com/products/zollabox-demarrage
To start all cycles and seed an aquarium at startup, and afterwards.

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How to introduce this biodiversity? (the logical order)

Creating an ecosystem means respecting a rhythm. Here is the optimal order: 

1. Microfauna (Daphnia and ostracods)
   → Aquarium cycling phase, bacteria installation and first living filters. The Zollabox start relies on this principle.

2. 
   
   Aquatic snails
   → Feed on bacterial colonies (biofilm) and the molts and first waste of microfauna.
   
   
   
   
   

3. Water lice
   → When the tank begins its maturation, they find food with the first organic waste that appears.

4. Fish or shrimp (optional)
   → Once there is no more nitrite spike and all biological cycles are robustly in place.

🔗 Article:
True aquatic biodiversity
→ https://aquazolla.com/blogs/news/microfaune-microbes-aquarium-naturel

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Conclusion: towards a self-sufficient aquarium

With bacteria, water lice, snails, microfauna, and plants, you let nature work for you.
Fewer devices, less maintenance, more observation, and true harmony at your home.

The goal: a stable, living aquarium where every being has its place and collaborates.

To complete this ecosystem, nothing beats an oxygenating plant that offers shelter and an ideal support for microfauna..

 

🔗 Product:
Hornwort → https://aquazolla.com/products/ceratophylle
Perfect complex support for microfauna, bacteria, shrimp, snails (which lay eggs there), and natural purification.