Why don't you post a picture so we can see what he looks like. Red Eyes change to a dark green at night but should be back to thier light green during the day time. If he is dark all the time there could be several factors that are affecting his color....temperature, humidity level, stress or other enviromental contitions. Please refer to the care article for Red Eyes on this forum to make sure that you are meeting his needs. Also if you could post a picture of him and his enclosure so maybe we could help you out more.