The amount of weight would be determined by too many factors. I assume it would be like SCUBA where you'd want to be weighted so with full lungs you float at eye level straight up and down, exhale and sink. Make sure you are using the same exposure suit and all the gear you'd carry. You'd be surprised how much can change.
Some of my friends overweight to get to the bottom faster, but I've found it tires me out faster. It's also incredibly dangerous. Either way, always dive with a buddy =]
(and don't mistake your buddy for a big grouper!)
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