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The 18 is a solid unit with 12* ducer , as HW said I fished mine to a 100’ and as little as 6’ with no problem
I would use anything that starts with FLX, way brighter than the standard FL vex's. I had the FL20 for many years and sold as soon as I got the FLX28, night and day differnce on being able to see everything happening. Just my 2c. Good luck with your search.