Urchin Poking Tang

[Kyleen]

My yellow tang periodically crashes into my longspine urchin in his travels around the 210. Once in a while it looks like he gets poked pretty good, the urchin looks likes he gets moved over about an inch.
Should this be concerning? Are either of them getting hurt? Is my tang dumb?
Urchin is about 9" tip to tip at his longest, if that matters.

 

[NanoCrazed]

The urchin certainly isn't getting hurt. Just watch out for infections on the tang if it's getting open wounds. At some point, the tang will learn.

 

[Kyleen]

No open wounds on the tang yet. I saw one of the urchin's spines in the sand. I've had them for weeks and they were being housed together in a 90 corner by the person I got them from.