What has worked for me... is taking a piece of clear plexi glass (the height should be a little more than that of your tank, and the same width); put the plexi glass in the tank near the corner of the tank, feed your fish in that corner, once they get there, use your plexi glass as a door, and trap them in the corner. Maybe you'll have all your fish in the corner but it's much much easier than moving all the LR ! :happyfish