Help! Female Guppy’s tail is turning black!

newaquariumguy77

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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 tank her tail started turning less black…. Let water sit in tank for 24 hours, water had been conditioned, added new bubbler and a live plant. Her tail keeps going from
IMG_8086.jpeg
Dark Black to more normal and back again? Is she sick? Stress? Help?
 

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