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so last night i was cleaning out my RES's tank and wen he went inside he pooped 2 times. so i was going to clean the fishnet to get it out,and than all of a sudden he eats one of his poop,i suddenly picked him up and tried getting it out. right when i put him back inside and going to get the fishnet,he eats the OTHER poop.
should i be worried about this?
and can this might be a reason i hardly see my turtles poop inside the tank?

I wouldn't be worried. There have been other people here whose turtles eat their poop. The only thing you can do to prevent it is try to get it out before he gets to it. I keep the fish net on top of the tank so I can grab it right away.