Indoor fishing Fishing tackle tests

Today, I tried to test the length of the needle collar that I think is important in house fishing. Last time at the Badaeong fishing spot, 10cm was the best. I tried fishing with a change of 6cm and 3cm, but I met the 3rd trumpet with the bait shaking on the 6m collar. And there was also a 3cm neckline. I do not know if I can make a change, but I like to fish while trying to do something like this. I did not catch a lot today, but I enjoyed fishing.