I can verify that grass carp will eat FA. I have seen the six I have moving into the mats and working them pretty good. The bloom occurred about a month ago. 80% of it has been removed or torn into small clumps.
The GC have moved onto the FA only because a lack of other more preferable food sources. They have also become pellet hogs, but I guess I can't blame them. I will re-assess the situation next year, but at least one or two of them will probably come out.
These fish were added in April and have grown 6-10" and doubled in weight. I have also seen these fish eat water lilies and curly leaf pondweed so they aren't too picky.
