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Old 09-15-2019, 03:11 AM   #1
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450L Green water in cycled aquarium

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

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Old 09-18-2019, 03:09 AM   #2
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Did something specific happen around the time you started seeing it?

UV is the most sure way to clear the tank.
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Old 09-19-2019, 01:56 AM   #3
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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

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Old 09-19-2019, 02:05 AM   #4
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Glad to hear it is working.
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