Posted: Sat Dec 03, 2005 2:05 pm
Welcome. From what you wrote, I'm a little confused over who the new guy in the tank is and why exactly your sweet RES suddenly can't eat. Before a new turtle is introduced to an existing tank, it's recommended that he be quarantined for at least 90 days to help make sure that the new turtle doesn't have a condition that could be transmitted to your turtle...
Like Missibsu asked, how big is the tank they're in? What is the set-up like? What size are the turtles (shell lengths), and is one considerably bigger than the other?
Are you feeding them together in the tank, and if so, is one of them hogging all the food on the other one and not giving him a chance to eat? (If so, it would be better if they were fed separately.)
You need to give more information about your turtles and their habitat ...
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-