What do you do when creating your aquascapes to ensure you still have good flow? What have you done to get around changing your scape to ensure you have good flow and nice random flow patterns? The reason I'm asking is I'll be ordering rock soon for my new build and have been thinking on possible issues with using a single MP40 on the back glass in a 50 gallon cube. I won't know what I have to work with until I order rock and not completely sure on what my plan is with rock placement.