Good gracious, I had no idea what I was starting...LOL
#1. If you borrow something, be sure to return it in a timely manner and in the same condition it was received in.
#2. If its not yours, Don't touch it.
#3. Don't follow so close behind other divers that they're constantly brushing you with their fins (it's annoying to both!)
#4. Keep your things in the space assigned to you. This may be a cubby hole, a box or the space under the 2 tanks you are diving. If possible attach your mask to your bc or put in the pocket. Place regs inside your bc to keep them close, neat AND protected. Put your fins under your tanks or where they belong so they are easy to put on when its time to enter the water. If you do not know where your assigned space is ask. Do not bring so much stuff that you have to use all the available space around you as this limits someone else from having enough space for their gear.
#5. Fill out the forms and make your payments correctly - otherwise you are just making extra work for accounting - - sorry
#6. If the camera rinse bucket is tiny and you have a monster camera rig, allow others to at least rinse their smaller cameras before you soak your big rig during the surface interval.
I'd modify #2 - If it isn't yours don't touch it needlessly. But if you see someone else's gear in harm's way, do something about it to prootect it and tell them.
#7. Look out for people who may be having a problem, and privately ask them whether you can help them.
#8. Don't rinse anything in the camera bucket that isn't a camera
#9. Feed the fish downwind, away from others and over the side
#10. Make way for those who have to go feed the fish NOW! We can't ask politely, as opening our mouths at that point could be disastrous!!
#11. When diving in a group, if the guide points out something interesting, let the non-photographers go first, then photographers then videographers. Be careful and considerate so as not to disturb the marine life (or other divers) as you approach and exit the spot and DON'T hog the spot. Take a few shots and let others in etc. You can return after the whole group goes through.