- signs of aging
- leaf holes and stains
- Check nutrient supply
- Change water regularly
- Other possible causes
Java fern is also prized for its rich green color. The plant, which originates from Southeast Asia, can also be easily cultivated in the aquarium. Even beginners can hardly make a mistake that the fern does not forgive. So how can the leaves turn brown?

signs of aging
The leaves of this plant also age and are therefore limited in their existence. That's not too bad, because many new leaf fronds grow back at the same time. So if old leaves turn brown, there is no need to worry. You can simply cut them off and remove them from the water.
leaf holes and stains
Occasionally, small holes in the leaf and black spots are also reported, which apparently have nothing to do with the normal aging process. Later the leaves turn brown.
Even among experienced aquarium owners there seems to be no clarity as to what causes brown leaves. It is therefore suspected and experimented with until there is an improvement. The living conditions and care of the fern are put to the test.
Check nutrient supply
Iron, potassium and occasionally magnesium deficiencies are suspected to be the cause. Measure this value and add the missing element to the water. But also adjust the future fertilization accordingly.
Change water regularly
Here, too, opinions differ. According to many aquarium owners, fresh, clean water should have a beneficial effect on the vitality of the plant. Others, on the other hand, have no problems if the water is only changed every four weeks. To be on the safe side, you can make changes and see if that solves the brown leaf problem.
Also optimize other important water values such as water hardness and CO2 content.
Other possible causes
- lack of light
- Change of location/moving to a new pool
tips
Make sure that the rhizome of the plant is bathed in water, this is the only way for it to thrive. You must therefore not plant the java fern. Instead, you should tie him to a rock or root.