Some of my 6"-8" YP are dying. Lost about 10 of the 40 6" to 8" YP stocked two weeks ago, and I have lost about 2 dozen of the 5 lbs FHM also. I checked the ph of my pond, it is 7.5, and checked the ammonia and it is .75. No more fish loses the past two days. Are there additional water checks I should be testing?