You might need to practice some tough love, stop offering anything besides the pellets and fresh veggies and I bet eventually he will come around. I have heard that dipping pellets in tuna water and letting them dry can help entice them a little too. Also check out the turtle jello shot recipe. The feeding and nutrition section talks about how much to feed.
"Turtle pellet colors, shapes and sizes vary between brands and product instructions are often too generous. A general guideline used by most keepers calls for the amount of pellets to be in proportion to the size of their heads (excluding their necks). Remember, pellets should only be offered every other day for yearlings and adults."
http://www.redearslider.com/pellets.htmlBoy or girl?
http://www.redearslider.com/determining_sex.htmlI would start by just reading all the sections on the main site, lots of info
