I think your problem has been answered. I just want to add that storing the full strength developer in full amber glass bottles or other light blocking bottles is best. Fill to the top to keep exposure to air at the very minimum. Some use marbles but I found that to be a nuisance. I got some brown bottles from a pharmacist a number of years ago. The have measurements and are easy to clean and have been faithful for over twenty years.

http://www.jeffreyglasser.com/