Im having a problem when i feed my koi..I put food in, but by the time the fish come up to get the food the skimmer has already dragged it over to the skimmer opening. i have a water fall which falls towards the opposite side of my skimmer so the water circles around the pond. i try to put the food in a spot which takes longer to get to the skimmer but only some of the fish eventually come up. any ideas?