[Dash]

Lawnmower blennies can get pretty big. I had a segmented blenny, which is a smaller version. Very cute guy.
You need a shrimp goby to pair up with a shrimp.
I had a firefish for about a year in the main tank, and although I saw no aggression from the other fish, all the goings-on were apparently too much for her, and she hid out of sight except for feeding - when I would see her for a few brief seconds. I now have one in my little softy tank, and with just a few small gentle tank mates, she is hanging out in the water column all the time