Management by Walking Around

Nur kontinuierliches, anteilnehmendes Beobachten lässt Störfälle frühzeitig erkennen. Rechtzeitiges Handeln verhindert oft grobe Eingriffe.

From “Aquarium Management” by Dr. Adrian Lawler (2007):

As we are dealing with living organisms held under unnatural conditions we can expect some failures (no doctor saves all human patients). Our goal is to learn from any failures so we can become more proficient and efficient.
Aquarium management is a never-ending job and a constant struggle to keep things running correctly.
It is bad management to make someone responsible for an aquarium, but then have someone else (usually with little or no knowledge of aquarium management) have final authority.