pH Problem

Hi,

My pond is about 6 weeks old. I've been testing the water almost daily
and cannot bring down the pH to a safe level. It has been running
consistently at 9.0. Over time I have poured about 5 bottles of PH
Down and other pH lowering brands but with no luck. I test the water
around 6:00 am and some evenings.

The pond is about 2600 gallons with liner, 4' deep in middle, rock
bottom, 6' stream with 2 waterfalls, 4000GPH Nursery Pro pump, lava
rocks and plants in the waterfall box. My tests have been running 0
ammonia, 0 nitrite, 0 Salt, 9 wide range ph. I have 15 fish from 2" -
4" which seem active and healthy. I also have many marginal plants.
I've been adding a dry bacteria about every 2 weeks.

My water is very clear but with a greenish tint. I am worried this
high pH will harm my fish. I am a beginner and still don't know much
about ponds.

Thanks,
Lois
.

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