Sounds like a lot of fun
I've had all my night dives so far in areas with good visibility (about 10 - 15 meters), what was my point is that without a light it changes nothing being in shallow waters, where you would think its not that dark.
OT question: do the pros like you have some kind of rope or something between the divers to prevent to loose the group in poor visibility? When I have been in such murky water (2 meters max vis) half of the group surfaced whereever because they have lost sight on the rest of us.