Red crab, was definitely a hitchhiker - Getting remarkably (to me) bigger

[BryanM]

I am very curious what sort of size he's going to get, and if I need to worry about him bothering other tank mates.

He was barely the size of a quarter in the first pic, and he's at least the size of a 1/2 dollar now, and its only been 5 weeks or so between pics.

 

[BristleWormHater]

Mithrax Ruber, very closely related to the emerald crab, I used to have one, but he took one to many bites of my coral, same goes for emeralds.

 

[BristleWormHater]

Mithrax Ruber, very closely related to the emerald crab, I used to have one, but he took one to many bites of my coral, same goes for emeralds.

Never mind its MIthraculus Ruber I think. Hard to get a latin name for these crabs, they arent't very well documented, and websites selling these crabs under false labels makes it harder.
Maybe @ISpeakForTheSeas knows the real Latin name?
Still the same thing, just an emerald crab but red, some people say they are more aggressive, but I think thats just because less people have them compared to emeralds.

 

[BryanM]

Well, right now he just wanders around, only seen every 2-3 days. When seen he's just nabbing algea like a mad man, with his popeye forearms, and eating it like there's no tomorrow.

His growth rate is what's alarming me.

 

[BristleWormHater]

Well, right now he just wanders around, only seen every 2-3 days. When seen he's just nabbing algea like a mad man, with his popeye forearms, and eating it like there's no tomorrow.

His growth rate is what's alarming me.

I wouldn't worry about him getting much biggger than that.