I used to have a 10 gallon fish tank that had about 15 little fish in it. The fish were glow in the dark and they were super cool and I was really excited to get the tank set up to put the fish in there. So, when I got the tank all set up and put the fish in there, the water was all cloudy when I put it in the tank and I wasn’t sure why. Turns out, I put water in the tank that was too hot and I burned the fish then they all got sucked up in the filter and I had to flush them down the toilet. Very sad day, but I got more fish, and I didn’t screw it up the second time.