When fishing a tube on a carolina rig I take a small piece of styrofoam peanut and stuff it into the head of the tube then squirt some Kickin Bass scent in there, the foam depending on how big a piece you use will make it float up off the bottom or else fall super slowly. If you rig it up and lay it in the water beside the boat allowing the sinker to go down about as far as your leader is long you can see the different effects of smaller or bigger pieces of foam. Works great for big smallies up North, I haven't really tried it here in Florida yet.