= a jumbo tetra biowheel. I remember seeing an article on that. that tank it's connected to looks like all reef tanks though, if that filter was never in place: the tank would be the same.
I know of a tetra biowheel tank that ran for 20 years as well, at the Wayland Plainview texas biology department under prof Hoyt Bowers. it ran a lungfish setup for that long. In the end I bet there are lots of 20 year old aerobic filter setups that ran aquariums.
nowadays we can see the use of that hardware in reefing isn't the majority. the hobby found even more creative ways of removing particulate waste vs pumping it into a drum.