...and the year you started working there was 19__ ?When I started the zoo project in St Paul, there were four fish systems. All were glass with plywood. All were well water pumped up to the system, and then run down the drain. No real filtration. A few native fish.
When I left, it was acrlyic, RO water, state of the art life support, reclaimed backwash water (to be 'green'), ozone generation for sterilization and a supporting quarantine area.
). They had internal corner filters (filled with carbon and floss and cleaned using the eye test...if they looked bad, they needed changing) driven by air stones pumped from a small air pump vibrating on my desk....and the year you started working there was 19__ ?
I remember that!, sometimes. but details are getting foggy..When earth was cooling and dinosaurs roam the planet as one of my coworker likes to say...
Back when I started keeping fish in the late 1950s, water changes were considered a bad thing, the under gravel filter was just invented, and we fed our oscars chicken and bologna. And then wondered why they all got hole in the head.