My bad. Not a video and he may have referenced it in another thread instead of this one, but I believe this is the reference article (instead of video).
Why Fish Cribs work and why they fail Most likely not everything would apply to ponds, but there is still a lot of good information on why fish may prefer certain types of artificial cover over others.
One of the key take-aways, in my opinion is this quote:
"Most people don�t understand that the secret ingredient that makes a crib design successful is not the frame or the exoskeleton, but the thick interior brush. If that�s not a central component from the start, or if it�s lost, cribs will stop attracting fish. The frame may stay intact and last for decades, but the brush deteriorates much more quickly. If there were some way to re-stock these cribs with interior brush, we could vastly extend their viability and lifetime."
