Greetings, Seamus, and welcome to the Forum!

We have a fair number of owners of tannic stained ponds here, so stand by for first hand experience and info.

In the meantime, be aware that if the pH is unfavorably low for fish, the pond can easily and safely be buffered with aglime. Do you happen to know what your pH is?


"Live like you'll die tomorrow, but manage your grass like you'll live forever."
-S. M. Stirling
[Linked Image from i.pinimg.com]