I find some of these comments incredibly judgy. Does everybody here see my profile picture? I flashed that giant flying squirrel right in front of me. It didn't care at all, neither did the owner. In fact, in all my years of visiting zoos and aquariums, I have almost always had a zookeeper or private holder given me permission to use a flashlight. The only problems I ever had were zoo fans who started screaming at me. I'm not saying that we should all flash a nocturnal animal, but I don't see why all of you and many others react so strongly to such a minor event. Great photographers worldwide, like Joel Sartore of National Geographic and Matthijs Kuijpers from Reptiles4all always use flashlights, and so do many field researchers & curators I know. I have not once heard of an animal having damage from this. Actually, I don't think it was ever proven that it harms any animal at all. Sure, it could result in temporary blindness, so says the internet, but I have never seen any proof of that. There is this strong, likeminded way that people have, in which they believe flashlights are horrible and hurt the animals. It is not. The highly professional deep sea research institutions of Okinawa Churaumi Aquarium & Aquamarine Fukushima are even so far that they allow flash in their aquariums. I'm not sure any animals are so used to the dark as deep-sea fish, I think that speaks for itself when it is allowed even there. All I'm saying is that we shouldn't judge so harshly because we have been told how terrible something is of which little long-term effects have ever been described. This is a confession page where someone is honest about his actions. Look how you are all reacting to him, about shining light on a tank that is being lit at night anyway. Not to mention this ironic fact: platypus have their eyes closed while diving.
I know this comment will probably result in a lot of backlash, and feel free to judge my actions if that makes you feel better. But do not act like someone is a bad person because they are so excited to photograph an animal that they use all the resources they have. The animal was not harmed, no captive animal was ever harmed by light. That way of thinking is purely based on speculation, rather than the animal's physiology.