I finished tearing this down tonight. I never got any baby White Clouds, but I did get baby red cherries and LOTS of dragonfly and damselfly larvae. I'm not sure why so much this year, but the White Clouds didn't do a very good job of keeping the larvae count down.
I'm thinking next year I might try some native fish in the container and see if they can do a better job. If so, I won't bother trying to keep shrimp.