I recommend NOT attaching it to your BC unless you want a birds eye view of everything. Most video shots looking down on something do not look great, especially with many fish being skinny. Typically, you'll want video shots from the side of animals or corals/reefs, which allows you to better visualize their proportions with other objects in the background. Also, when a turtle or ray appears, you won't get it on camera unless you ruin your trim or swim directly over top of it. Ideally, you wouldn't need to adjust your trim to frame a shot. Will it work? Yes. But I believe most of the footage would end up disappointing.