Cleaning Guppy Fish Tank I Cleaned My Tank And ALL My Fish Except One Died. Why ?

I cleaned My Tank and ALL my fish Except One died. Why ? - cleaning guppy fish tank

I had a goldfish in a male guppy guppy and two other women. One day I'll clean my tank, and when I get the fish in the tank was clean, killing all but one of my female guppies! Can someone tell me, if you happen to an idea, why is that?