Thanks Bill. Now if I can only maintain that variance without over heating the pond. I've reduced run time to 3 hours over the weekend, and have started running from 7a-10a as of this morning because my surface temp is already crowding 80f, and the variance is still holding. I have pond dye arriving tomorrow to try help with shading and to hopefully reduce some FA.

.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!!