One time one of my friends came over during a wc. He said he wanted to help . So I let him help. I told him what to do and got him started siphoning. While he was doing that I went to get a couple things. I came back to see that he was putting soap in the tank instead of declorinator. I had no where to put the fish so they all died.

in the end lost $80 worth of fish and 4 days devoted to cleaning the filters and gravel. Now I do wc by myself so if I mess up then there's no one to blame but me. That was not a good day.
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