Thats exactly the situation I've found myself in snrub. After checking temps yesterday evening, I found only 3 degrees difference between water 20" deep and on the bottom. Even with elevated diffusers, the bottom temp is 88 degrees....way too warm. I've cut my run cycle in half as of last night, running only 6 hours, since I'm apparently over circulating the pond.

Hopefully, this shorter run will still give me a good mix, but allow for some natural cooling at depth. Time will tell.

Edit: when I adjusted my run time yesterday, I reduced hours from both ends of the cycle. After some thought, I'll make another adjustment today to have the pump running from 2am till 8am. Hopefully this will allow for more cooling prior to start-up and add oxygen during that period when its most needed.

Last edited by Mike Whatley; 08/24/18 07:16 AM.
.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!