I hate to see you go without any answers to your post, so I will add
my two cents even though I really don't have an answer.

1. Have you tested your water with one of those home pond test kits
to see if there is something that might be killing the fish? If you
have and it is OK, you might want to take a sample of your water to
one of those places that tests drinking water and see what kind of
results you get.

2. Have you introduced any new plants? Are any of them toxic to
fish?

3. If it is not your water and not your plants, then it almost seems
it must be the epoxy eventhough I find that hard to believe. You
could cover up the problem and any future leaks by installing a rubber
pond liner.

I hope something I have mentioned helps.
Glenn Lynn

On Sun, 25 Jan 2004 00:31:09 GMT, "Bubba"
wrote:

I have an outdoor pond - concrete and masonry - - perhaps 4 ft x 10 feet by
a couple of feet deep. It has an effective filtration and circulation
system. Until last year, my critters lived in it in peace and harmony.

Then:

It began to lose water fairly rapidly through a large crack that had
developed in the bottom. I drained the pond and called in my favorite
neighborhood handyman who cured the problem by cleaning out the crack and
filling it with an epoxy compound. The pond no longer loses water - - now
it kills fish. Everything I introduce to the pond DIES. After many months
(and many sacrificial fish) I declare myself thoroughly STUMPED.

Any ideas? I innately suspect that the epoxy has something to do with it,
but the water has been changed and filtered so long that it doesn't seem
plausible.

Any or all suggestions, ideas, hints, cures, curses, spells or incantations
will be cheerfully
appreciated.