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Most likely ammonia poisoning. What size aquarium is he in, and have you done a water change since you got him. Test for ammonia (using a liquid test kit). Even if you don't have a test kit now, I would recommend doing a 50% water change right away. Remember to use a good water conditioner (declorinator) and match the temp. of the replacement water with the temp. in the tank. If you tell me what size tank you have, I can recommend a good water change schedule for you. Oh, and do you have a gravel vacuum? You should vacuum the gravel when you do a water change to prevent buildup and potentially harmful bacteria. I think that there is a sticky somewhere in the "starting and maintaining a freshwater aquarium" section that talks about cycling that you should read. Do you know what an aquarium cycle is? If not this article will help you understand and be able to help your fish as your aquarium cycles.
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