oldsconv , welcome and to answer one of your questions - if anyone out there has tried stocking their pond with multiple predators and prey species - the answer is yes. Norm has such a pond. Here is a link to his info. Send him a PM or email or look at his posts here.

http://www.pondboss.com/forums/ubbthreads.php?ubb=showprofile&User=854

See this thread ***

http://www.pondboss.com/forums/ubbthreads.php?ubb=showflat&Main=1750&Number=19302#Post19302


Go for it and keep us posted.