I am currently putting in panels to divide my skimmer from a refuge area. Im actually going to put my refuge into an old bio media tower in which I have cut a few (6 total) 3/4 holes to create a little flow, but not too much. Will I need to use 3 panels for my divider/bubble trap, or could 2 down/up panels work if I put a sponge at the base of the panel that it up? Thanks!