Ok iv noticed maybe twice now my pleco grazing over my turtles shell . Problem ? The turtle itself Disney mind doesn’t even move in fact and it lasts maybe a few seconds before the pleco moves on is this just helping to keep the turtles shell from algae or something more sinister iv read stories of plecos destroying acrylic tanks by wearing down holes through constant abrasions, could a pleco actually destroy a turtles shell or am I just a mother on the play ground