i have been struggling with getting a good white balance for the basketball gym i shoot in. i have been told that my photos lately have some green in them from a bad WB setting. for this game i recently shot i took a WB reading off a white piece of paper center court and made it a custom WB setting in camera and then used the shot to adjust all the WB in my shots in light room 3. this photo from the other night seems to represent our gym rather well considering our walls really are off white with a pee yellow ceiling, gym was built in 70's. i do not have a fancy monitor so i have never seen the green that was mentioned in the past. can you guys let me know how the colors in the shot look WB wise.
the gym im shooting in has uneven mixed lighting. this shot was taken with my 7D and 50 1.8 at ISO 2500 f2 1/500
thanks in advance. i hope to get some advice and feed back.
example of an older shot that i am told has some green in it





I usually take a picture of the white backboard or my white (ok...dirty gray white
) tennis shoes using "auto" white balance. Then go into the menu and select the picture and set it to the "custom white balance" click ok. then I go ahead and select the custom icon. After that the whites in the picture is fairly close that I rarely have to fix it on import. 
