I have about 30-40 turtles that come to the feeder each time it goes off, it's annoying that I have to feed them, they are vacuums but the bluegill have become more aggressive fighting for food...
I do consider them a clean up crew as well so I leave them be... I'll clean a fish or two on my doc and toss them in figuring the turtles are going to clean up those for me.
Heck I use to hand feed and the turtles would come rushing to the dock anytime I came out... they even began following me around the pond when I was in the boat.