I usually quarantine for 2 months, and have found it often takes that long for certain diseases to become obvious.
A friend who runs the aqua exhibit at a municipal zoo, quarantines all fish and inverts, for no less than 6 months befor adding to a a display tank.
Many fish can be asymptomatic carriers, either because they have built up immunity over time to such things as ick, or that they carry a phage that is species specific.
In some cases diseases are so minute, that they go unnoticed when just observing a tank, so photos of all new fish allows for detailed observation.
taking 100 photos per day and analyzing each of the non-blurry ones for the tiniest spot or infection is not out of the ordinary.

A friend who runs the aqua exhibit at a municipal zoo, quarantines all fish and inverts, for no less than 6 months befor adding to a a display tank.
Many fish can be asymptomatic carriers, either because they have built up immunity over time to such things as ick, or that they carry a phage that is species specific.
In some cases diseases are so minute, that they go unnoticed when just observing a tank, so photos of all new fish allows for detailed observation.
taking 100 photos per day and analyzing each of the non-blurry ones for the tiniest spot or infection is not out of the ordinary.

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