My wife and I were there the last week of February last year. The diving was OK, but nothing spectacular. We had a lot of OW divers the week we were there, and coupled with the fact your doing 3-4 dives a day on air (nitrox is not an option), most dives are in the 50-60 feet deep range. A lot of the diving is sandy bottom with coral heads scattered around. We did a few deeper dives with more corals. We did get to see quite a bit of sea life. The shark dive was pretty cool.
I don't remember seeing anyone mention the tank setup. When you board the boat and stow your personal effects in your bunk and your fins, mask, and other dive gear under the benches on deck, you will fnd the tank with your name on it. You will set it up with your BCD, regs, weights (if integrated), and any other gear you might want that can stay attached. It will stay attached for the duration of the cruise. You won't necessarily be in the same spot all week as the crew will direct you where to park it after each dive.The tanks will be refilled in place. You will need to remove the 1st stage from the tank valve so they can refill you tank. It is a rather efficient method of handling this part of the operation.
So have fun. I think you'll enjoy yourself.
