The Longnose Hawkfish adults can grow to the MAX of 10.0 cm (4 inches) thats length from nose to end of tail, so really a small fish.
These fish are very peaceful and not aggressive. They will not bother corals in a reef, but being that they are carnivores, I could see it eating smaller ornamental shrimp and smaller hermit crabs though. My shrimps are bigger then him so the longnose stays away.
