Thanks oddiseus, yeah that was the favourite part of my degree using the CAD software for building renders and animation but im almost finished 1 semester left till graduation, thank god no i will miss being a student.
anyway im just going to use one pump as the max flow you can get out of it is 260GPH so think thats actually plenty for the size of tank. I got a bit confused and didnt think they were powerfull enough, so have just ordered one i also ordered my Tunze DOC nano skimmer.
I was planning on plumbing a line over to the right side for a spread of flow was just being lazy in the CAD drawing.