just go to a home improvment store, go into the lighting section ask for the flooresent light screen from a drop ceiling and use the plastic egg crate that is what the drop ceiling light screen is as a divider. pick up two ceramic bricks, you know the ones with the 3 holes and zip tie it to the bricks. put one on each side to hold the screen in place. this holds large flower horns apart so it should work for your oscars. the aros may jump across, but it is the best you could do. the cheapest aswell.