I've seldom heard of them thriving long term.....below is part of a well prepared article by Rob Toonen ...the full text can be found at one of the popular on-line monthly magazines...
"I wanted to make a point of emphasizing that the survival record of flame scallops in captivity has traditionally been extremely poor. The typical experience of people who buy them is that the animal tries its best at hiding (often with the aquarist having to pick it out of the rockwork numerous times so that it is visible in the aquarium) for a while before eventually giving up and slowly dying. Even when the rest of the reef tank is flourishing, people who add a flame scallop to their tank typically watch as it slowly wastes away over a period as short as a couple of months to a maximum of about six to ten months. I would guess that the single most common cause for the demise of flame scallops in any aquarium is quite simply starvation. Although I should also point out right off the bat that these animals are relatively short-lived (something on the order of about three to four years maximum, and I’ll come back to this later), there are still precious few reports of these animals surviving in captivity for more than a year or so. Sadly, the 6-10 months that most people manage to keep a flame scallop in their tank is also a reasonable estimate of how long it should take a well-fed animal to starve to death after collection and being placed in an aquarium in which it is deprived of food. So, if you’re really set on trying to add one of these attractive and interesting animals to your tank, you need to make a serious effort to provide it with the appropriate conditions to keep it healthy and well-fed in captivity. Hopefully, by the end of this article you will have some idea of how best to go about providing for the needs of these beautiful animals, and I hope that we may start seeing some more reports of long-term success with keeping them in captivity"
