I really can't tell whether it is running through the dam or just leaking rainwater and running down the back. Is it also doing that on the front? Or, it could be running under the dam and just above the key.

I think I would pump it out and take a look. Yeah, I know.......

A small key? What does that mean? What is small? How small?

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