I've never heard of having to "reclay" a pond. Ask yourself where the old clay could go. Usually, they either leak or don't when they are built. I would be suspicious about it holding water for years.
Look at the pond when it rains and see if there is a noticeable place where the water goes. You might have to only fix it in one spot.
Bentonite has shown mixed results and can get pretty expensive. Two ft of well packed clay is generally all it takes to fix a bottom leak. Have it packed by a sheepsfoot roller, not a dozer.
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 Grandpa
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