I finally witnessed a grass car actively feeding on berries floating on the water...he stayed under the tree the entire 3 hrs I was there...it was a good 40lbs...he didnt miss a single one and there is no doubt a berrie fly will seal the deal but I let him eat this time...was kinda cool...there was thousands of berries left on the tree so I am sure it will be ongoing...better use the 10wt because there are some really big ones in there