Night creatures are awesome!... stuff you don't typically see during the day. Only dislike is when you're back on the boat after the dive, it can get pretty nippy on a cold night with the wind chill... that's when all I can think about is warm shower!
If you're taking photos, make sure your buddy sticks close to you. It's easy to get engrossed with composing your macro shot and next thing you know, you look up and your dive buddy and the rest are no where in sight. If that happens, don't panic... cover or switch of your lights and look for signs of their dive lights or glow sticks. I'm sharing this from personal experience.