A quick update: The ponds ended up being without a pump for 12 days. Fortunately, the fish seem no worse for the experience. I'm sure the large size of the ponds and low stocking rate were key to not having any major issues. The highest water temp I saw was 75°F. They were very excited when water started flowing down the waterfall and stream though!
When we install our bog filter in a few months, I think it would be prudent to have a second pump that feeds the bog. How does that work when I have a skimmer? The current setup has just one intake via the skimmer which then feeds the waterfall to the upper pond. The pump is submerged in the skimmer.
When we install our bog filter in a few months, I think it would be prudent to have a second pump that feeds the bog. How does that work when I have a skimmer? The current setup has just one intake via the skimmer which then feeds the waterfall to the upper pond. The pump is submerged in the skimmer.