I have a bicolor blenny with a yellow watchman goby together in a 12 gallon without incident. the bicolor sleeps in a hole on top of the rock the watchman sleeps under. it's a beautiful and peaceful relationship. I also have an algea blenny in my 55 gallon with a royal dottyback and yellowhead jawfish, all have the same kind of bosy shape and all are living in harmony. So i doubt you'll have any problems at all, especially in a 75g reef tank. of course my situation may be the exception..
125gal. megaflow. Fish Residents:
Yellow Tang -(Junior), Flame Angel -(Flamey)
Bicolor Blenny -(Butch), Randall Jawfish -(Jaws)
Lawnmower Blenny -(Lenny), Talbot's Damsel -(Dottie), Tomato Clown -(Ketchup)
Nameless fish include, Neon Blenny, Singapore Shrimp Goby, Yellow Tail Damsel, 1 Skunk Cleaner Shrimps, purple pseudochromis.