what would that mean if he did show discomfort from light? luckily i havent seen that yet in my fish. although i have seen a few video bloggers talk about their new fish who never come out from the shadows of their reef and would hide when the lights come on.
Toss the API type, they are worthless as color range is UNRELIABLE. 
Hiding from light can be a couple of symptoms. One is it can be a sensitivity to light caused by velvet. Velvet is partially photosynthetic, so the thinking is to not help the parasite by giving it light until your QT has reached therapeutic level and the copper is killing the free swimmer stage of growth. Another can just be stressful for the fish. Some of the fish we choose for our tanks are not partial to strong light and they react accordingly.
Bad Ich or perhaps velvet for it to have gone so quickly. So many shippers and shops are using sub-therapeutic levels of copper to keep loses low and fish looking presentable for sale these days. The problem is that the sub-therapeutic copper wears off within a few days or up to 30 days and the velvet comes roaring back, often without the normal external symptoms but with heavy internal parasite attack on the fish's gills, etc. So by the time you finally "see" some external spotting, etc. it's almost too late to save the fish. Consider prophylactically treating with copper quickly with new incoming fish for today's reality.
