black tail

Hey all, I’m new to fish/aquarium’s, I have a 5 gallon aquarium, 3 female guppy’s, 1 male guppy and a snail. Water was cloudy for a week, and it started getting better the second week, but I noticed one of my females guppy’s tails had turned black. Did a full tank clean, and in the secondary...

Long time reader first time writer. Our orange male guppy is turning black around the tail and top fin. We had him for about 3 months and this started a month and a half ago. 5 gallon tank. Him and a pal plus a snail. Change 1/3rd the water every week without ever missing. Using Tera easy strips...