Several thoughts to start this process. Welcome to PB and don't get discouraged. Cat has some good thoughts.

How much fertilizer did you put in? I doubt that is the problem as it only lasts about a year max. A pond always reflects the dirt it sits on as to productivity. Does the water clear in winter ? I have never heard of a plankton bloom that does not decrease in cold weather.

First suggestion - call Shawn Banks in your general area and talk to him. Tell him you come via Pond Boss. web page http://forums.pondboss.com/ubbthreads.php?ubb=showprofile&User=758 phone -
816-804-5604


Second post pics of the water.

Get the dirt and water tested - see this link http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92617#Post92617 it note MO , Ark and others.