Here's the whole story of what happened. The fish system that I am referring to is the one at my work. It has 63 tanks plumbed into the system. There are 2 sumps that consist of 3 pumps. 2 of the pumps pump water into the aquariums and the other pumps water into the bio balls and fluidized bedding chambers. On Friday, two associates approached me about low water flow to about some of the tanks. The system has snail issues and we thought that cleaning the loc lines would fix the issue. So, we turned both sump systems off and did some maintenance. When it came to put the systems back online, we ran into a few problems. The main one (which is still going on) is that one of the pumps that feeds water into the fish tanks won't come back online. The pump was not warm and did not have the vibrations the other one had. The other pump came back online with no issues. My first thought was check the breakers. One was tripped and I fixed that. Tried the pump again and it was nothing. My next thought was to plug the pump into an outlet I knew was working. I did and the pump kicked on but it was making a loud whirring noise. Then, it shut off completely and I have not been able to get it turned on. I have been simmering on what could be the issue and I am thinking that since the water flow was poor to begin with, that the pump was on its last leg and just finally died. Any other thoughts (other than don't let me work on your system)?