Hello all. I have about a 1400 gallon pond with about 12 goldfish. I have 2 Iris, and a small pond Lilly, and some other small plants. The pond is surrounded with moss rock, which I am assuming is sandstone, I have some river rock of various sizes and some rip rap lining the bottom and sides of the pond. I am using a Savio skimmer with filter, and have a 10" aerating stone in the bottom of my pond which runs 24/7. My water pump runs only during the daylight.
I am getting green water and a little bit of string algae. I had some toads that mated in my pond, and I noticed that all of the tadpoles died immediately before leaving the slimy stuff they lay. That is what concerned me, so I did a full water test (pH, Nitrate, Nitrite, and Phosphorus). All is good, but my pH is off the charts (>9.0). I added some pics. I read somewhere that adding 1/4 cup of white vinegar per 500 gallons would help lower my pH. Does anyone have any suggestions? Is it possible that any of the rocks would cause this alkaline water?
