Seamus, after enough chlorine applications to kill everything in about a dozen Olympic sized swimming pools, I pumped it dry. In my case, I pushed some big, freshly knocked down, post oak trees into the bottom of the pond. It rained a lot a couple of days later and the water turned black. I stocked and it was lethal.

However, not all tannin colored water is lethal. Do a fish test and see what happens. You may not have a problem.

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP