Started building my 540 for rays, discus and a silver aro. I'm planning the plumbing routes and am looking for opinions. Would I be beat just to run my standpipes center of the back wall and the returns along the sides? Looking to optimize water being turned over. Is there any layouts that you guys can suggest might work better? I was thinking of 2 2" overflows returned from a 35-4500 gph pump in a 2" broke to 2 1" piped then again into four 1/2" returns. What are some of your thoughts? Spraybar maybe? Open to any and all suggestions! Thanks guys