Java fern disease?

[gnicolon]

I have a question, my java fern leaves turn black and disintegrate, it has happened to me several times, only last the rhizome and leaves grow again.


Is it a disease? lack of nutrients?


thanks for your help

 

[Solcielo lawrencia]

I think it's just poor conditions leads to this problem. It's probably due to a lack of nutrients. Regardless, what should happen is that new plantlets develop on these leaves and is one way the fern can propagate.

 

[gnicolon]

Thank you for your reponse, the problem continue with java fern, I measured nitrates and are above 40 ppm, is this harmful for the plants?

View attachment 9301

 

[gnicolon]

aquarium details


Tank - 250 litres


Light - 4 bulbs 32W low consump


photoperiod - 8 hours a day


co2 - diy citric acid and baking soda


filter - canister 1200 L/h with sponge and siporax as filter media


homemade soil (humus, clay and sand)


water changes - 50% weekly


fishes - Discus, tetras, corydoras

 

[Solcielo lawrencia]

What is the potassium dosing?

 

[gnicolon]

Fertilization is N-P-K 15-3-15 ppm and Fe (and micros) 0.05 ppm a week

 

[gnicolon]

Photo of my tank

View attachment 9302

 

[Solcielo lawrencia]

Just cut it off. New growth should be fine.