10-18-2012, 07:04 PM
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It may well be adjustment. As the previous response noted, corys like groups. [I realize this one is in QT, and will assume you have others in the tank he will be going into, but if not, I wold get a few more.] They also do not like being moved at all; any new tank will usually cause them stress, this can't be avoided, so keep things calm, ensure good water. Don't feed if he is not searching the substrate; they can go for several days without food, and if they are unsettled this may be best. For one thing, uneaten food will more quickly foul the water causing more stress.
It always is best to buy corys in a group, if you are adding to your existing stock, try to get 2 or 3 (or more, depending) at a time. This will settle them a bit.