Many people who add a new root to their aquarium are surprised when a white or translucent film appears on the wood. It can look slimy, sometimes almost like jelly. It is often called slime or biofilm.
This is common on some types of aquarium wood, especially at the beginning. But it does not always mean that something is wrong.
The important thing is to understand why it happens, when to care, and why different roots may behave differently.
What is slime or biofilm?
Biofilm is a thin film of microorganisms growing on a surface. In aquariums, it can occur on wood, stone, filter parts, glass and other materials.
It is often more visible on new roots, as the wood can release substances that microorganisms quickly grow on.
This is why biofilms often appear quite quickly after the root has been put in water. It is not the root that "moulds" in the same way as food that has gone bad. Rather, it is a biological reaction in a new, moist and nutrient-rich microclimate.
Why does Spiderwood often get a lot of cinema coverage?
Spiderwood usually develops more visible slime and biofilm than many other roots. This may be due to the wood releasing more readily available organic matter in the beginning.
When these substances enter the water, bacteria and other microorganisms quickly have something to live on. This allows the white film to grow on the surface.
In many aquariums, it disappears over time, especially if the aquarium is stable and has shrimps, snails or fish grazing on the surface. However, during the start-up phase, it can look ugly and make the aquarium feel unfinished.
In sensitive or newly started aquariums, high organic leakage can also be a reason to keep a close eye on water levels.
Does biofilm mean that the root is dangerous?
Not automatically.
A little biofilm on a new root is often a normal part of settling in. But a lot of slime can be disturbing, especially if the aquarium is already new, the filter is not mature or you have sensitive animals.
If you get a lot of cinema film, you can:
- brush or rinse the root gently outside the aquarium
- change some water more often during the start
- suck away loose biofilm with a hose
- avoid overfeeding at the same time
- monitor nitrite and other water values in newly started aquariums
Most of it is about keeping the start calm, not about panicking.
Why does Tuskwood often behave more calmly?
Tuskwood does not generally form the thick white biofilm that many associate with spiderwood.
It depends on the nature of the material and how the roots are handled. Tuskwood is old, dense and naturally formed bogwood. The roots are cleaned to remove loose material, while preserving the natural surface.
This does not mean that nothing living can ever grow on a Tuskwood root. An aquarium is always a biological system. But in our experience, Tuskwood doesn't tend to get the same kind of slimy run-in phase that spiderwood often gets.
This makes the root feel more like a finished part of the aquarium.
Always rinse and brush before use
Whichever root you use, it should be rinsed before it goes into the aquarium.
Brush off loose material, soil, dust and particles. This reduces the risk of unnecessary organic matter getting into the water and makes starting easier.
Tuskwood does not normally need to be treated as a problem to be "fixed" before use, but it is still a natural material. A simple rinse and brushing is a good habit.
You can read more on our page with care and handling.
When should you pay extra attention?
Pay extra attention if the aquarium is brand new, if the filter is not broken in, if you have sensitive shrimp or fish, or if the biofilm becomes very thick and starts to come off in large quantities.
In this case, it is wise to take it easy, make smaller water changes and follow the water values.
This is especially true if you use wood species that often release more organic material in the beginning.
In short
Slime and biofilm on new aquarium roots is common, especially on spiderwood. This is often because the wood releases nutrients on which microorganisms quickly grow.
A little biofilm is usually not a sign of disaster, but a lot of slime can be disturbing and require more attention in the beginning.
Tuskwood generally behaves more calmly. This is one of the reasons why many people choose Tuskwood when they want a root that feels natural, stable and ready in the aquarium more quickly.