I am not exactly sure what your goals are but I do know that if you are feeding your fish generally you do not need to fertilize because this creates excess nutrients which in return causes FA. I probably wouldn't treat the FA unless it becomes a reoccurring issue as far as restocking FHM it couldn't hurt but might be a waste if there are many small bass in the pond. Grass Shrimp are good for any pond and the FA could act as temporary shelter for them to get a population started. I am no expert basically just relaying what I have learned from the good people here on the forum and I'm sure someone will correct me if needed on any advice given.

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1 acre pond with YP,HBG,RES,HSB,SMB,GSH,FHM