Since the filter is placed in the middle of the tank in the back, when the fish travel across the front of the tank they do fight the flow a little bit but they don't seem to be constantly struggling. I am only feeding finely crushed up xtreme krill flake and Aquarium Coop's fry food. I find that at the water's surface, the food gets blown around so much that it makes it hard for the fish to get to as they are constantly trying to chase it but I would say that 3-5 minutes after feeding, the tank doesn't look like it has been fed.