Theo, The 1.25 inch drainhole was not threaded all the way to the inside so I took a 1 inch connector with a 90 degree bend (elbow?), wrapped some electrical tape around it until I could just wedge it into the inside part of the hole. The opening of the elbow faces down and allowed about a .5 inch gap from the bottom. When I open the drain valve the water comes rushing out (and most of the waste) but the perch can't quite squeeze under and are learning to avoid the area when I clean it.
