I don't know what I'd do without Alice, the aquarium expert and fish pond lady. Whenever she and her crew come out to clean my pond and re-stock it, I always stick around in the back yard. There is a lot to learn just listening to her.
Alice emailed last night, and told me to shut off the pump to the waterfall. Let no water circulate for 24 hours, and if the water level in the pond stays full, then there is a leak in the vinyl liner in my waterfall.
Did it. So far so good. Will check again tomorrow morning.
I was a little disappointed not to see my mosquito fish in the pond. Maybe they all died during the cold weather. Well, no matter -- they are cheap if I need to stock the pond again. It's always something.