I only feed the tiny ones until they hit the 2" mark, then they seem to be just fine on their own. I do because I've done a lot of reading on clam propagation and rearing, and my personal experience dictates that target feeding the smaller clams work out to a better survival rate in my tanks. To each their own though. I've had as many as 25 clams at one point, and don't do anything for them other then water quality, placement and lighting.
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