I must admit I still struggle figuring out what I'm looking at on my Humminbird. I was out today trolling under a bridge and my screen was filled up with little specks. Notice how there's a band of red with a band of blue on top. Sometimes it was just solid blue without the red. What am I looking at?? Small bait, brush, thermocline? I was scouting for a place to night fish for crappie and wanted to see what was down there. Anyone having any luck night fishing for crappie on Lanier? Thanks,