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Scallops should be treated similar to feather dusters and other filter-feeding organisms. Most books will tell you that scallops require a LOT of feeding and that most will not survive 6 months in a tank. (Anyone have one longer?)
They survive the 6 months by living off their reserves. Unlike coral or tridacnid clams, there is NO photosynthetic algae living in it's tissue.
There are some who argue that these should not be sold to hobbyists.
About a year or so ago, when my 75 was still up and running, I tried my hands at a Flame Scallop. The first time I saw it "swim", yes, SWIM, my jaw dropped. I was in awe, and couldn't believe my eyes.
Well, the excitement didn't last all too long, because just as Phil said, within a little less than 6 months I found an empty shell.
I strive for a nutrient low system since I mainly grow SPS, and I believe that was most likely the culprit of its demise. I have yet to hear success stories, where people keep these beautiful and interesting animals for a long period of time (2 years +).