size of mercatoris

[derek11]

how big does O. Mercatoris get. there is one for sale at my lfs and i am thinking about purchasing it. Is it an active octo or will it spend most of the day hiding?

 

[derek11]

check out this craigslist.com posting. can anyone tell me what kind of octo this guy has. i really would like to pick it up if its bimac or vulgaris. any ideas
http://sfbay.craigslist.org/eby/for/233874885.html

 

[Animal Mother]

My mercatoris is 100% nocturnal. Their mantle only reaches 2cm, less than an inch.