There are ways to treat for FA and several were noted above. There is an extensive archive on FA at http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92633#Post92633

CUSO4 can harm fish in 2 ways. In low alkalinity waters it can inhibit gill function and the ability of fish to uptake O2 and they suffocate. In most waters CU (from CUSO4 but not from chelated copper)can build up in the pond bottom and cause problems with the food chain including fish.

One suggestion is manual removal. If it is just around the edge you can rake a lot of it out. It is work but it removes the bound nutrients out of the pond. IMO that is the best method for all purposes. Water and soil tests are a very good idea. So is iding the FA type as treatments for all species are not the same. So is reducing the nutrient load as per Bill's note.

Last edited by ewest; 03/08/13 10:06 AM.