I have a Spotted mandarin and a Scooter Blennie that are both in my 90g, Used to have a bicolor blennie in there as well, all play nice.... the ONLY thing I have noticed is my Spotted Mandarin chases my Scooter Blennie around if he gets to close during feeding time, other than that they have played nice for almost a year!
(Edit: My Spotted Mandarin was purchased to save a Green Manadrin that was being attacked by him in a small coral tank at the LFS so I knew his temperament before purchase, and kept an eye on it! )
Edited by justchillinuno - February 11 2015 at 10:21am