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Other names: Ammonia poisoning
Fish jump out of the water,
Darkening of body color (Black discoloration)
Fish turn a dark color, they try to jump out of the aquarium, and eventually die unless a water change is performed.
Intoxication is likely to occur in the aquarium with alkaline water (pH over 8) unless a partial water change is performed regularly and gravel is cleaned.
How to cure:
Immediate water change and gravel cleaning.
Timely aquarium cleaning and water change (water replacement does not substitute water change).
Fish susceptible to the disease/disorder: