pic of my 75. Tried to make it as close to natural as possible. Looks to me like your rock is kind of stacked into a wall, which there is nothing wrong with, but you don't get as much flow as u want that way. I think a lot of people get the misconception of putting there live rock together like a jig saw puzzle and try to find a piece to fit in the hole, when actually the opposite is what you want to do. leave plenty of gaps and caves for fish and water to be able to flow through.