Hello, I have a 220 Gallon aquarium that we decided to completely take apart, and we're ready to start reassembling it as we've finally received the frames. I'm curious- what should we use to 'maintain' a gap between the bottom pane and the side panes? It's a Marineland tank, and Marineland frame, so the panes must sit on top to fit the frame. I've been recommended cabinet stoppers, but we can't find any small enough. I appreciate any input.