Cleaner Shrimp : Strange Behaviour

[Captainhemo]

I do not have nay fihs in this tank, is it possible he'd still set up shop w/o fish ? I have never had a cleaner before so this behaviour is new to me but now that you have mentioned that, its almost like that is what he is doing, he seems to be waiting there for something !!
I did recently add a tuxedo urchin and a stawberry snail, but he wouldnt be waiting to clean them would he ? I guess maybe I should get a fish or wo so he has something to do ?

Thanks