Tom,
Good luck with the fish. I always like to know all the options available to solve a situation.
The Corn meal actually does not promote a phytoplankton bloom. It actually promotes the reduction of fertilization components and can be considered an easier and less timing sensitive method compared to fertilization.
I refer you to a post on the subject fertilization and the care required to get it right.
http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=1;t=000094 J.W.
