George1 has experience with the CNBG-HSB combination in a smaller pond similar to yours. Hopefully he will share his insight on this. You might be somewhat behind in the stocking stratigy if usine HSB due to their reproduction getting a head start. Lets hear what George says.
Here is some background from George on the topic as your homework.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=132149http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=96494http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=281600http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=279603
George uses tipaia for algae control in this small pond.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=185530