Great tank! How many gallons is it? And little Bamboo is precious!
About the gravel in the bottom of the tank though......Most of it looks a little too large for your turtle to swallow. Your turtle's growing, though. When he gets a little bigger he'll be able to swallow those rocks. And there are probably some smaller pieces of rock in there that he could swallow right now.
There have just been too many threads on here where turtles have eaten rocks with disasterous results. People don't know it's dangerous because the people in the pet stores don't know, and it's ok to put rocks in with fish so why not with turtles?
Here are some threads on why it's not a good idea to keep gravel in a turtle tank:
http://www.redearslider.com/forum/viewt ... ght=gravel
(the person in the thread above took the gravel out of the turtle tank immediately when he found out it could be dangerous but it was too late, the turtle had already eaten some.)
http://www.redearslider.com/forum/viewt ... ght=gravel
http://www.redearslider.com/forum/viewt ... ght=gravel