Urchin's leave white trail?

[Mini Coop]

Well,
Against the advice of my friend who has an urchin that carries stuff EVERYWHERE around her tank, I was having some hair algae issues, and got a rose urchin. He has already unglued one of my corals and carried it around! HAHA!!
I think its kind of cute Anyway - he is leaving a white trail everywhere he goes . . . are my rocks that dirty, and he is THAT good of a cleaner? Or something I should be concerned about?

 

[Mini Coop]

Forgot the image

 

[Ocean Lotion]

They really clean down to the bare surface of rock as they move. I will be picking up another urchin soon. My last one lived for three years. Enjoy.

 

[Jasonnew2reefing]

I have two and let me tell ya they do a wonderful job

 

[sneub]

Not sure regarding the white stuff, however my two urchin are fantastic cleaners, hard one of them for over a year.

 

[4RunnerAdam]

I know this an old thread, but is the white trail clean rocks or poo? I'm having the same issue. I turn the white lights on and it mostly disappears..