Welcome to the forum slowmo!
I'm concerned about the behavior of the pale one. RES come in a range of color variants - from very dark green to almost yellow, so yours could be a normal pale one. However, a pale shell and skin could also be a sign of poor health.
What concerns me most is that he's not active. A brand new turtle is usually very nervous. He might pull into his shell to hide from you but he would also try to run away or find a hiding place. A turtle that's just still all the time is either cold or is not feeling well. Poor appetite is common in brand new turtles, like was mentioned above, because they are too nervous to eat. However, poor appetite is also a sign of not feeling good (or else being too cold).
Keep an eye on him. Make sure the water temperature is warm enough. For little turtles the water temperature should be around 78 degrees. For a sick little turtle it should be increased to 80 or 82.
Any sick turtle should be quaranteed from a well one. Most turtle illnesses are contageous and you sure don't want two sick ones.
If the temperature is warm enough and he doesn't perk up in a day or two I'd start looking for a vet. If you need to go to the vet's, be sure you go to one that knows about herps (reptiles). Most dog and cat doctors don't have experience with reptiles. The ones that specialize will advertise that they treat reptiles or exotics.
Here's a standard caution I give everyone who might be having to take their turtle to a vet: : If the vet offers to give a vitamin A shot, first make sure the vet is positive your turtle really needs vitamin A and then discuss other alternatives to shots with the vet like eye drops with vitamin A, cod liver oil or food supplements. Several turtles have recently had very bad reactions to vitamin A shots and I think it's best that if vitamin A is needed (and often it's not) the safer methods be used instead.
Finally, the tub your turtles are in isn't really set up like a turtle habitat. I know they are brand new and you probably just haven't had time yet to set it up properly. Be sure and take care of the setup right away because a decent setup is essential if your guys are going to stay healthy. There's a gold mine of info on caring for a turtle on this site. To help get you started, here's a link on equipment:
http://www.redearslider.com/startup.html