Ok I Have 4 New Black Skirt Tetras.. I Bought Them 3 Days Ago And Their Fin Were White The Next Day I Noticed They Were Getting Darker. Yesterday They They All Had All Black Fins. Today I Did A 25% Water Change And Added Stress Coat To Remove The Chlorine And I Now Notice Their 2 Tetras Fins Turned White, 1 Is Becoming White And The Other One Is Black(hasnt Changed) ? Im Almost Sure It Has Something To Do With The Water Change? Im Not Sure What I Did Wrong? The Water Was About The Same Temperature. Im Not Sure Help Anybody?