Pond Boss Forums MANAGING AN EXISTING POND Fertilization To fert or not from anaylisis?

Those are really good numbers Doug! Fertilizing could start a bloom, but a little goes a long way and can be very easily overdone. Contrary to what DonBBB says, I would steer clear of adding any phosphate as it may promote a Filamentous Algae bloom instead of Phytoplankton.


FWIW, grass carp often take about 3 years to make noticeable changes in the plant dynamics. Since you are coming up on your third year, next season may be different. Next year, I would also try to kill one-third of your largest grass carp and replace them with new, 12+" GC.