Fiirst it was an african clawed frog, then my ghost knife, and today it was my panda cory cat. I don't kno why. The ghost knife had white hair lookin stuff on it when it died, so Tuesday I treated for protozoan parasites, and then today it was the cory cat. I'm in fear of losing my silver aro... I just did a 25% water change, and I'm going tom to get a ph test kit... any help will be appreciated