I am looking for advice. I have a 700 gallon pond with koi, snails, lillies, oxygenators and I did have hyacinth. One of my koi got fin and mouth rot. So, I added 1 lb. of salt per 100 gallons over three days. That was two weeks ago. My fish seems to be getting better, but my hyacinth burned up and died. We had a heat wave during the treatment. It was over 100 for several days. The other plants and fish are fine. My question is , Did I add too much salt or add it too quickly? Should I take out some water and add fresh? The water seems to be cloudier the last few day also. We use Microbe Lift and it had been clear. I would like to get more hyacinth next spring but not if they will just die again. Thanks.