I have three red ear sliders and I have noticed that atleast two of them sometimes seem to be "pooping" out a large black thing that looks almost like a mushroom. The turtle will push it out and then it will get sucked back in. At first I thought perhaps it was a prolapse, but I think that they are usually pink or white. What else could this be?? The picture that I have linked to shows the black thing at one of it's smaller stages...I have seen it get twice the size of this.
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