FA forms on the bottom and as it nears its life cycle end and as O from its respiration increases in the filaments it breaks loose and floats to the surface. If you can prevent light penetration to the bottom FA will be reduced. Light penetration can be reduced with dye or plankton blooms. Nutrients can be reduced by other plant growth. Also a much more difficult process can be used to make sure that a limiting factor to plant growth can be introduced (for example no P). Chemical suppression is also a possible option.