I'd go at least 5 tons for starters. You can always add more once it's settled. I don't think you can add too much, tho, so go with your gut.
.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!!
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