i just cleaned my pond and normally I do a full water change and I have had no problems. But yesterday I did a full water change and scrubbed my pond with a dobie scrubber and rinsed my pond out and filled back up and I put my fish back in it and all 35 fish are dead in less then 24hrs. Only 3 are left and the are the biggest being about 7inches. But are not doin good. I don’t know what to do. The only thing I did differently was use the scrubber.