Hi Folks: Visited an aquarium in Dubrovnik Croatia last week. Met a vulgaris of which I would like to keep as a pet. It was dormant for the prior visitors to the tank yet when I stepped up, it became active and fascinating to observe. I was surprised that the tank size was not as big as I thought it needed to be to house the animal. Not a Giant Pacific to be sure but I am trying to gauge just how big it really is and how big a tank I would really need to keep one. I am aware of the articles here about ownership and am very serious about it. I just need to figure out how much it really costs when one thinks about utility bills and food and how often you need to feed it.