No issue between the Yoyo and the shrimps at all. The yoyo's biggest issue is digging up the HC's and other random plants time to time in his search for fallen food. He's not very good at finding floating food, for some reason, so he resorts to digging and sticking his nose into the gravel.
I have to say, he single handedly keeps this tank interesting as he bothers everyone! The resident a-hole of the tank