Weird green urate

Several weeks ago I noticed green urates from my male pied. At the time I thought it may be mold so I changed out his substrate. Then again today I found another green urate. He has been a picky eater since I got him, but has actually been eaten more consistently the past couple weeks. He seems fine otherwise. Anyone seen anything like this?
http://i1200.photobucket.com/albums/...psaef8tnun.jpg

Yup. Comes out green every once in awhile.

Thanks for the reply. Even if has happened several times in a row? You are probably right, I just want to be sure.

I've never seen the urate green but my biggest girl's paper towels sometimes has a green tint to them when she pees.

Yeah there doesn't seem to be much on the internet about green urate. Plenty on green poo, but his are just normal colored.

No input from other experienced breeders on here?