Simple Questions from new diver

[AandA]

Regarding night diving in the tropics, my husband, daughter and I did a night dive in Cozumel this past spring and moon or no, having a light was both mandatory by the DM as well as needed. We'd never do a night dive without each of us having a light. The dive shop rented lights for those who didn't have any. We had a wonderful dive and saw so many different creatures from what we'd seen during the day. It was really GREAT!! ;D We all had gotten our advanced certification the summer before which included a night dive, so we were set.