We don't feed so the grass carp have only weeds to eat. We have a small beach and slope down gently on one end for swimming. When I put the grass carp in there was literally a wall of weeds at around 3' deep all the way around the pond. It was thick enough to show up on the surface. The kids would swim over it to get to deeper water where their feet wouldn't touch the weeds.

Yesterday I walked in as deep as I could touch and keep my head above water (I'm 5'8") and NO WEEDS!!! At least along the beach. Still a few areas around the steeper sides but there is definite progress. Have only seen a few fin flashes, don't have a good view of how big they are getting.

Which leads to a couple of questions. When the weeds are gone will they eat cattails? Still have plenty of those. We have four (one died about 2 weeks after I put them in). Seems after the initial clean out one or two could keep the weeds in check. What's the best advice to catch them? I have a friend with a serious weed problem and a couple of my GC could do great work in his pond...and have better less crowded lives.