Crazy acting Koi
Recently I have noticed my Koi "flashing" I think that's what it is?? They swim up to rocks or plants and roll sideways away.... a couple of them have also been jumping up out of the water a little bit ??
I have done some searching and it seems like one reason maybe because of a high PH level. So I checked it and it is approx 9.0 ??
My question is if this is the reason how do I get it back down to acceptable ranges?
My pond is 3000+ gals. with a Aquascape skimmer and waterfalls, I have good amount of plants and 25 Koi from 2" - 10" and 4 up to 16"+. I have rocks on the bottom. Beginning of July I added MicroLift PL and then last week ponvac some debris out and replaced about a 15% water change in the process. Could the town water be the cause?? Some remedies for lowering PH levels is a small water change, I even realized that some of my lilly's have gotten yellow pad's??