I have 5 yoyos and I need a clever way to keep them out of my HOB filter. I currently have the top off the filter and I stuffed a pointy plastic plant between the filter and the backstrip to keep them from swimming up into the filter (I've picked 2 out already; one received a nasty scratch on its back from getting stuck. Not to worry, he's all better now). Is there a clever way to keep them out of the filter without keeping this nasty looking orange plant stuffed in the top of my tank? I'd like to put the top back on the filter as well.