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He may be adapting to his new tank, that or he's in shock since you did not acclimate him properly. Fish-in cycle, you'll need a liquid testing kit for ammonia, nitrItes, and nitrAtes, test for ammonia and nitrItes everyday, whenever ammonia or nitrItes or both is 0.25ppm or over do a 50% water change just water, once nitrItes drop down start testing nitrAtes, and once there's no reading of ammonia and nitrItes along with a reading of 10 ~ 20ppm of nitrAtes you'll know it's cycled.
Hope that helps. :)
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