09-11-2011, 03:16 PM
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Corys generally do not like being moved, so they frequently respond by higher-than-normal activity. Constantly swimming up and down the side of the tank, or lengthwise along the rear or front glass, singly or in groups. They will settle provided all else is OK, sometimes in hours, sometimes days, sometimes a few weeks. Normal cruising will be slower than this frantic activity.
Is the Emerald a true cory, Corydoras aeneus, or is it Brochis splendens? Check the profiles (click the shaded names), they describe the difference and there are photos, the dorsal fin is the key.