100 CC seems like a lot to me too! Unless you plan on harvesting most of them at the 1 pound stage. That's a lot of fillets and could still be a dangerous with regards to an oxygen crash. That's 100 pounds of fish in less than a 1/16th acre pond. 20 sounds better to me and just feed them pellets and grow some big cats taking a few every year.
Anthropic gets my vote for BG pond with the one LMB as population control. Maybe consider HBG (hybrid blue gill).
With regards to the FHM's. Stock them early, like now, and give the pond most of the summer before adding the game fish. This will make many, many more so long as you give them some pallets (or the like) for laying their eggs on. After that, adding FHM's will just be expensive food. Use pellets instead.
I had a carp hitch hike in with my FHM's. So, you cannot be too careful when inspecting the to-be-stocked fish for unwanted species.
