08-22-2012, 06:45 PM
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If the other fish in this tank are fine (I'm assuming those listed as in the 55g are still there, except for the gourami you mentioned), and you have not observed any physical attacks by other fish, this gourami may have been damaged in moving. Or it may be a health issue, which is very difficult to diagnose at the best of times.
I assume you have checked ammonia, nitrite, nitrate, pH and temp? Any one of these changing suddenly, or being present in the case of the first two, can be the problem.