We've now done 3 days of diving. 1st day was Grand Cenote & Chac Mool. Grand Cenote was very pretty. Chac Mool gave me my first taste of a halocline. Not really a big deal, the visual distortions in the halocline were interesting. 2nd day we dove in Cenote Pet Cemetery. Very nice stone formations. On dive 2 I got to experience my first complete silt- out. No big deal, the line was right beside me, I immediately got on it, the dive was called & I swam back to clear water, just as I wast trained to do. Overall, the dives were great! Day 3 we dove Tux Kabaxa (SP?). We did a 100 min dive up the mainline. Very pretty, but a massively long swim. Dive 2 we went looking for the line to the Bone room, But were unable to locate it. Not absolutely sure of the dive location for today. Guess I'll find out when we get there. As for weighting, I wore 6 lbs on my harness belt 1st day, 2nd day I wore a 1.5kg v-weight. Yesterday at Tux, I forgot to put any weight on & did just fine,.... so now I have my answer,.... I need no weight in double AL 80's,.... a good thing.