I have a 72g BF and I was just trying to get a better idea on powerhead placement for good flow. I have 2 hydor koralia 2's. Right now i have on on the left side on the back glass pointed towards the middle of the front glass. The second on is on the right side glass placed a lil more then half way down the glass pointed straight along the back wall. my return line is pointed towards the center and up for surface agitation. Any ideas would help.