Just picked up a Canary Blenny. I had one once before and really liked it. They are always busy picking at the rocks, but are usually out and about where you they can be seen.
IMO one of the best alternatives for someone looking to add bright yellow in their tank. They don't seem to perch like a lot of blennies. Although mine does snuggle up inside of my green toadstool at night. They also seem to like to go into holes...in my old 50 mine would venture into the closed loop when I had it off for maintenance.
Although they apparently are venomous, mine has never tried to bite. I think it is something they use as a defense. According to what I have read, if they are eaten apparently they make an attempt to bite the inside of their attacker's mouth to get away.
