I'm going to let the ducks that arrived stay in the fish pond.
Why would you let the ducks stay in the fish pond?
Because the ducks are much cuter than the fish and I like them more.
The ducks will probably destroy your pond and eat the fish, so you shouldn't let them in there. I know they are cute, but they will ruin your pond.
I don't really care about the fish anyway.
It sounds like the ducks don't belong in the fish pond. The fish were there first and their habitat should be protected. Try to find another location for the ducks to live.