Cute babies.
I'd still add a deeper substrate of compost for them to dig into. Also, you may want to double check your incubation temperatures. I have noticed that incubating the eggs above 82 degrees F often results in split scutes. They don't seem to affect the turtles much, so it isn't critical.
Nice job with the water feature. That is one of the most difficult things to provide for such tiny little turtles.
As for the little guy with the bad foot. It appears to be an infection...are you treating with anything? Twice daily soaks in an antimicrobial solution and even treatment with a topical antimicrobial ointment may be necessary. Also, you may want to keep him/her separated because the others may bite at the leg if it smells funny.