Instruct: Classify Amazon reviews into positive or negative sentiment
Query: DANGEROUS

I bought this for my return pump for my 90 gallon tank and was also using it to fill that tank and broken before I finished. I replaced the pump and a month later(this week) I got shocked pretty bad and I assumed it was my heater so I took it out and left in my other one. Next morning the pump died and the water was extremely hot so I assumed it over heated and I put it in a bucket with cold water and it still didn't run, I gave it a hour and tried again and it worked however I did notice black flakes in the water before and checked the seal and it looked very cut up and worn so I checked the voltage in the water bucket while it was running with my multimeter and there was 115 volts in the water. This pump not only almost killed my fish by not letting them get heat(heaters in the sump) but almost fried me and them. I just bought a sicce and never plan on going back to danner