I completely agree with Aggie05 and Daniel411. Your tank is way too small to house such a sensitive invertibrate. Your most likely going to overdose such a small tank in the first feeding for the scallop. Water conditions could also easily change in such a small environment, causing the scallop massive amounts of stress.
I would say around 99% of flame scallops 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 phytoplankton, Golden Pearls would also be good for feedings.
Here is a good article on feeding.
Graham
