Can anyone ID this critter

[Beng2003]

Hello. After my new tank had an ick outbreak at the end of April, I started my fish less cycle. As I looked more closely in my tank a couple days ago I noticed this guys wandering my rocks. As I’m new to the saltwater hobby, and just had my outbreak, I’m a little superstitious worrying that he might do harm

 

[William Mumford]

Isopod. Good guy.

 

[Beng2003]

Isopod. Good guy.

thank you. It didn’t look bad but I had to be sure