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Did you dose for the whole aquarium size or the PWC you did? Did you add the correct amount? Did you noticed anything about the fish after PWC? Sitting at the bottom not moving? At the top gasping for air....etc or was all normal?
Everything was normal..but then one black tetra went quick pale and died and now have had two further tetras die.. I only dosed for the amount I did a wc.. Will another change help ??