What do you think, break down the barrier right away or let the new addition settle out first?
That is a good question. Don't have an answer for you though. Maybe others will have opinions. I never had the patience to wait, so on the two ponds I had experience with expanding where the new area was dug then joined with the old,(one very small pond, the other larger) I joined them together as soon as the new portion of excavation was done.
