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How long have you had him in that tank, what kind of lights and how long are the light on, do you have a background on the tank, how big is the tank, how much and how often are the water changes, water temp, filter, live plants, additives used, appetite, tankmate, type of decorations in the tank and anything outside or near the tank that he may be responding to....can you post a pic......
The reasons can vary for the behavior he is displaying...and it can be normal to abnormal based on the answers to the questions.....
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