Hi Zridd and welcome to Pond Boss. FA can be chemically treated to stop it's growth or, if they are legal in your state, Tilapia can be stocked that will (1) IIRC, eat the FA and (2) provide a forage source.

Hang on and one of the resident experts will give you a quality answer (as opposed to the dribble that I've just posted).

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)