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This blenny goes nuts for shrimpHard to tell from the pics. Most "herbivores" in our tanks will eat other foods.
There is a general mislabeling/ misunderstanding of the term. An herbivore is an animal that feeds mainly or only on plants. Its digestive system is adapted to break down and absorb nutrients from plants. It doesn't mean they won't also eat other types of food.
I agree with this ID, it looks almost identical to the photo the OP has shown.The "horns" on that guy are quite unique. My first thought was a Parablennius sp., but I'm currently leaning toward it possibly being Istiblennius meleagris - the Peacock Rockskipper or (apparently) Blue Spot Blenny. It comes a variety of colors (the below specimen being quite dark).
Here's a link with more photos to compare with:Blue Spot Blenny – GeeMarine
geemarine.com.au