Sorry if this is too gross, but I'm a little concerned for my male RES. I'm sort of new to RES's, and I've had this one for almost a year now. He is 6 inches in length.
Of course I don't watch him 24/7. But the other day I glanced over and noticed, from a distance, what looked like a giant black ball trying to come out of his butt hole... It kept going in and out. It was so long/big it could almost reach halfway up his stomach. Is this a normal occurrence with RES? Is he trying to poop? Is there something wrong with his intestines, possibly?
This was over a day ago. And I don't see anything in the tank if it did ever come out of him. Or he ate it.