Tom, we always have a couple lights each but try to keep them off if the moon was out. Eels and groupers are like the big puppy dogs of the deep. Actually very gentle critters unless you present your hand like "food". Morays have really bad eyesight, so fingers look like tasty hot dogs to them. What used to creep me out was....100% of the time....looking over my shoulder and seeing a barracuda enjoying the dive with me. I've never heard of anyone getting bit by one but their toothy presence is always there.