Thanks for all the inputs guys. Very helpful for me. Nate read my thoughts exactly. For my situation and goals, I defined the perfect predator:
1. I can put and take as needed. Maintaining the "right" size and numbers
2. Capable of eating a lot of 7" BCP or BG
2. Has limited or little chance for reproduction
3. Doesn't compete with a BCP preferred forage(s)
4. Inexpensive and readily available
NP!
Maybe, I don't know. Watch, I will have a freak pond and the NP recruitment will be huge!

Now that would be one large mess of a pond.
Nate - I have 3 stocked now. You would take it to 10 and wait until they were 28" to remove. They are 18-20" now. How long to get to 28" assuming unlimited food?