2 acre pond in South Carolina stocked gradually over past 8 months LMB, BG, mosquito fish, Tilapia. Had 8-10’ depth now down to max of 3’ due to drought. Water is brown and Sechi is 5”, added phosphorous binder last week and beneficial bacteria 3 days ago. Running 2 bottom aerators 24/7 now, adding fountain today, stopped feeding 2 days ago but had BG eating. Past 2 days finding dead BG and mosquito fish along edges, all 2 inches and under, some piping. I would have thought the larger fish would die first if low DO? What am i missing and any other recommendations?