Symptoms: Goldfish has red streaks in tail fin; Goldfish has red blotches on body only; Goldfish has broken blood vessels; Goldfish is in distress
Nitrite; the second toxin to be converted in the nitrogen cycle. Closely related to nitrates, but symptoms don't always show until after the fact. Goldfish have no tolerance for this toxin.
Refer to:
Step 5: Water Treatment
http://www.goldfish-emergency.com/vi...hp?page_id=174
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