I need help!
I have a preformed pond that I have had for a couple of years.
After the winter I cleaned it and started filtering and added a concrete waterfall feature. The pond is only 120 gallons with a smaller 100 gallon pond elevated above with a spill over into the larger one.
My problem is that the larger pond accumalates a lot of bubbles on the walls and shelf of the pond. I tested the water and everything seems normal except the alkaline is a little high.
I lost one Koi yesterday and the others are not eating and staying on the botton of the pond.
I moved the remaining fish from the pond until I can figure out what to do.
I did a water change of about 30% and within 8 hours or so the bubbles were back.
I called the local pond supplier and they had not heard of anything like that.
Any advise on what to look for?
Thanks