Hi Mt. There aren't many fish that we can get in central/northern CA that will eat FA (at least as far as I know). Grass Carp are illegal and FA doesn't seem to be something that they like to eat. Tilapia are great at controlling FA but once again, it's not a fish that we can have.

Cutrine Plus is cheap, easy, and readily available if you are considering a chemical solution.

FA does die back in the winter (at least at my elevation of 2,100 feet). But it always rages back in the summer.

You can also buy water "shading" products (aqua shade, etc) but they have other side effects that are not disirable (IMHO).

That's my two cents worth.

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)