Prepare for fun. JDs rock. Mine is a hair under 6" now and I've had him for 7 months. The rate of color development varies from fish to fish. Check the pics of mine in my gallery. His blue is coming in really good now.
thanks Jason_S , he's in a growout right now, very bare, purple and white gravel with a pvc 3 way tube as his home, when he gets large enough not to be swallowed i'm going to try putting him with my oscar who is very mild