All of the downfalls were pointed out to him and he made the right decision. At least he asked first
One of the things to keep in mind here is tank "gallons" and rock "pounds" is not the best gauge on a system. I had well over 400lbs of rock in my shark tank but it sat on top of a 4" square PVC so the sharks had a cave the length of the tank. A 125 gallon tank could be 6 feet long or 8 feet long.
Another thing to keep in mind is that some of the available "books" and "information" on the web are either outdated and/or inaccurate. I'm speaking from my personal experience. I'm also not saying it is easy to keep these sharks. It's a daily committment of time and money that I noted by posting the link to the article I wrote. The numbers in that chart were reflective of my routine monthly. Atelomycterus sharks spend most of their time swimming within the reef rock work/structure avoiding being eaten. They are well suited to move around small spaces that is amazing when witnessed. So they are a good candidates for larger aquariums (at least 6' long or larger cubes). Much better than the Banded Catshark (Chiloscyllium punctatum) which does get much larger and requires much more space.
Regardless, I'm not taking sides on the issue but rather passing on my experience
.