Well I am going to go out on a limb [sure to get some people upset] and suggest a split shot or two on the floating section of your line. I assume [bad thing to do] that you will be trolling in your tube so casting would be out of the question as it would get your line in in all kinds of trouble. I am only suggesting this if buying any additional equipment including a proper line as suggested would be a financial burden at this time. I personally have never resorted to this practice but when all else fails PUNT.
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