Ok I have 6 Black Skirt Tetras and I noticed some white spots on one of them in the tail. At first I thought it was just food particles but I didn't rule out Ich. I have been checking my tank and everything seems in order but now ALL 6 of my Tetras have white spots. I have experienced this before with another tank I had. I am pretty sure it is Ich but it seems to only affect the Black Tetras. Is it something in these fish that makes them so weak to Ich? I am going to treat it today any suggestions on what I should use? Thanks in advance. Also I will try to get pics posted to show you what I mean.