Lizzy,
I use snapper slappers all the time, they are great lures. I always put a sardine on it and drop it to the bottom, never fails! I actually make my own leaders with steel wire, they are very easy to make. I make them in different lengths, from 12" to 36". Snappers and Groupers will try to get you into the rig, so the steel will help protect you.
Good luck
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"The sure way to get a bite while fishing is to talk about changing spots"