hi...i have chicks that are about 2 weeks old..and i can tell that they need to start perching on something...but my problem is..i have them in a rubbermaid type tub...with screen over the top....how do i put a perch in that?..if i had a big cardboard box i'd use that and stick the perch through the sides(saw that a recent post)..any ideas, please, thanks, Wendy