The trout I'n there now are alive, and surface feed. Not every day but do. Are you telling me to get larger pump Bill ? I took readings all over the pond west end 54, east end 54 , 12 ft depth where spring slides I'n pond 50, 18 ft hole 46, 12 ft hole north end 48. When i did have defuser I'n 18 ft hole,,, wow i stunk like sulfer over that spot I'n boat. Dead sea down there i bet . I should mention 1/4 of pond only get sun light for 6 hours I'n mourning. Trees shade south side of pond.