Posted: Mon Nov 26, 2012 1:04 am Re: Need advice!!
Welcome to the forums! It's commendable that you have seeked help.
The link that ljapa posted is a great place to start. At 2-years-old, your turtle should no longer be considered a hatchling. This means that water temperature, basking temperature, and feeding schedule can be engraved in stone, as they will be the basically same for the rest of the turtle's many years.
After the first year (when the fastest natural growth happens), feeding can safely be restricted to 3 times per week. I have friends that feed every other day with enough pellets to fill an "empty head," while other friends only feed 1-2 times per week, giving enough pellets to gorge the turtles for 10 minutes or so. Both methods are acceptable, but make sure you stick to one or the other. Routine is extremely important with turtle feeding, but keep the food variety broad.
I usually buy an extra head of green-leaf lettuce every week for my girl. The darker the leaf, the better. Pellet brand is important, as well. I use Mazuri turtle diet, but I believe ReptoMin and a few others are reputable.
2.5 inches for a 2-year-old is a little on the small end, but it is not unhealthy. With proper care, including a UV light, your turtle will quickly grow larger and stronger.
-Chris