You talking about the Lobster? It is about 6" as for it's body. It's antennas are close to a foot. One has been clipped down before I removed it from the Fuscus Trigger tank. One thing that I thought was cool is that they antennas grow back in one molting. The Fuscus did this once before. He clipped down both antennas, and a section of the tail. In one molt everything grew back.
I may try to keep it with my Queen Trigger, but I am not going to hold my breath for success. There is another guy on here keeping a Queen, a Clown, and a Pinktail Trigger with a Shrimp! So who knows. Right now this Lobster is in a divided 120 gallon. Somebody is supposed to buy it, but it may fall through.
In any event you know I live in Michigan right. I'd have to ship it. I know how to ship. I used to breed Cichlids, and ship them. But I might give this Lobster a try here. It is fine now. I would like to remove the tank divider one day though. And I am not sure if the Queen will leave it alone.