heelllp me! i need some advice.

hey everyone, i know this is probably ALL too common of a question, but i need some advice about my baby RES.

he is in a nice big tank, that i keep appropriately warm all the time, 75-80 degrees or so, and i clean out his tank really well every few days, but he has been acting a bit... strange.

first of all i've had him for about a week or two now, and so far he hasn't eaten anything yet. i've tried small worms, those little turtle sticks, pellets and tiny live crickets. but he has just ignored all of it. i'm not sure if this is normal or not.

secondly, despite this until yesterday he was EXTREMELY vigorous, swimming around all the time, crawling on the rocks, and occasionally basking. He seems really healthy and active.

but today when i came in, he had buried himself under a bunch of pebbles, like he was getting ready to hibernate or something. i'm confused because i always keep his tank really warm, and keep the lights on for 12-14 hours per day to "trick" him into thinking it's summer. do turtles sometime bury themselves just for fun?

what is going on with this little guy? also, why won't he eat? is he dying or am i paranoid? haha heeelllp!

how big is it, sometimes when i get a new turtle that doest like to eat right at first i offer them a small amount of fresh meat(fish, chicken, beef).
where i live the wild turtles do burry themselves from time to time. just keep an eye on him.
if hes staying active you should be ok, but if he starts getting slow, sluggish and inactive you might need to worry a little more

I don't own any turtles but my friends have had a RES for years and she just mentioned last week that hers stops eating around this time of year...a turtle person will probably clear things up for you....just wanted to put your mind at ease.

thanks guys!

Do you have sufficient lighting for him/her?You need a basking spot and a UV light!Also,the water needs to be warmer,like 82 to 85 degrees.And...baby turtles are very shy and fearful!Put food in and stay away.For the turtle,you are this huge,potential predator that could eat him/her so it is afraid.Are there any other pets that could scare it?