Awesome, I built one and am gonna try that out. I used a pvc end cap that fit a pipe strainer I had and drilled the back for a suction cup. I'll try using that today.I cut a small piece of pipe 4”/5” or so, drilled maybe 15 holes in it in random places big enough for the cbb mouth to fit into and then a couple of caps on each end. Loved it and instantly found the food inside the pipe interesting.