Being a young and naive hobbyist, I bought a maxima crocea clam on site. They are certainly beautiful, but it died right away. I paid $100 for it, and luckily my lfs guy replaced it. He felt it had nothing to do with my tank, but it just didn't make the trauma of the trip from the ocean to my tank. He only had it a couple of days before it went into my tank, and it was probably the last straw for the poor thing. Anyway, he's replaced the crocea on Tuesday, with one he's had for a few weeks in his tank, and he is doing great. He opened up right away, and hasn't tried to move. I have 2 400W MH and the actinic lights. He's very near the top of the tank on a flat rock. Wish me luck. If I had known that they were so tempemental I wouldn't have got one so quick. Tank has only been established for about 3 months, and I'm really a beginner. I feed my 220G tank 3 capfuls of calcium and 3 capfuls of minerals everyday. Do the clams need any additional food?