NicHardenFishing

When I’m following schools of bass, sometimes 10-15 in a school, they will fade away on the screen, almost to the point completely losing them. You can throw to the tad bit of movement you still see and the fish will glow when they come up to your bait. Is there any setting I need to change to keep the fish I’m chasing bright? I keep my gain between 65 and 72. Any help would be appreciated.