... because mine does. I was under the impression that pleco's were herbivours and isn't beef heart for carnivours? My red zebra won't even touch the beef heart but my pleco goes right to it. Even when there are veggies in the tank he seems to prefer the beef heart over all else 
I don't think it's relevent but here is a picture of my pleco (sorry for the quality issue, i had to use the camera on my phone and it's a little shabby):
I don't think it's relevent but here is a picture of my pleco (sorry for the quality issue, i had to use the camera on my phone and it's a little shabby):