450L Green water in cycled aquarium

The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.

Roninem

Aquarium Advice Newbie
Joined
Sep 15, 2019
Messages
2
Hello

Would appreciate an expert advice to resolve the problem of water turning constantly green regardless aquarium is fully cycled since long time.

Tank Juwel Vision 450, water parameters (measured with JBL):
Water temp 25C
PH 6.9
KH 6
GH 7
NH4 Ammonium <0.05
NO2 Nitrite <0.01
NO3 Nitrate <0.5
PO4 Phosphate <0.02
SiO2 Silicate <0.1
Fe <0.02

I use CO2 (ca 25mg/l).

Fishes:
11 Denison Barbs
40 Cardinal Tetras
5 Siamese Algae Eaters
5 Corydoras

Aquarium was fine for months, see first picture IMG_4844.JPG

Since a month it looks greenish and even if I tried weekly water changes the green comes back quickly, see next two pictures.

Has someone experienced such and can help how to solve it?

Thank you
Roninem

IMG_4844.jpgIMG_5516.jpgIMG_5515.jpg
 
No changes

No changes indeed apart reducing fertilizer, maybe such impacted balance between plants and algae but I am not sure, installed UV eheim 800, 3 days and water clear, not yet perfect but getting better

Roninem
 
Back
Top Bottom