The only downside I've heard of is that they are pretty enthusiastic egg eaters. All fish impact others and they will eat a lot of eggs. That said, everything eats everything in the pond anyway. I wouldn't sweat it.

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