The foam is most likely disolved organic compounds (DOCs). You can buy
products to help remove them, or you could do a couple of water changes to
dilute it a little bit. On the other hand, it could be the fish spawning,
but since you just added them, I don't think that's it.

Hope this helps,
Bob



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"Carl Beyer" wrote in message
...
I have looked into a number of books, and don't seem to see why this
might be happening or what the solution is.

White foam is on the top of my pond (450 gal). I recently added a
couple of Koi and a few goldfish. I do not yet have a UV Filter, but do
have a biological that is still breaking in.

Thanks for any suggestions

Carl

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