What made you start?

It's a LONG story. I was working as a custodian at a school and my supervisor had a 15 gallon tank with a near dead damsel fish. I took it out of the tank to get a pic of it and it died because the ocean water they took for the tank had become so watered down by tap water that it was barely brackish on top of them putting a chunk of concrete in it for "decoration." My coworkers called me fish killer despite me being the only one willing to set up a new system. They would only ever added water into the first one when the pump started grinding because it got too low.