I know i'm going a bit off topic, but do you know how difficult these are to sucessfully keep alive? I would say around 99% of them die within the first couple of months of being purchased, if not sooner. Many are not collected properly and are seriously damaged when you get them.
They also tend to be reclusive, prefering to stay in crevices or under rocks with just their tentacles being out in the open. Many people try to remove them to more veiwable places, but this usually results in damage to the byssal gland that sectretes the threads they use to attach themselves to rocks, resulting in stress and damage to the scallop.
These are also filter feeders which will need a lot of food. This means that you tank will foul quickly if you don't have a very good filtration system on it. Lack of food is probably the #1 cause of death. They tend to feed on foods which are not readily availible at your LFS. It's posible to culture the foods such as phytoplankton, zooplankton, rotifers, and copepods, but doing so would need time and money. Golden Pearls would also be good for feedings.
http://www.advancedaquarist.com/iss...2002/toonen.htm has a good article on feeding.
Anyway, it looks like it's in great shape with a strong byssal gland! Nice picture!
Take Care,
Graham