DT's phytoplankton or other similar "green water/live phyto" type product.
I would do as Jason suggests though. Otherwise, at least in my experience, for the clams to get enough, you end up feeding too much for the tank and then you "tank your parameters" (ie. spike your bad levels). And then the clams die anyhow. So be careful it's a very fine balance.
Ca and Alk need to maintained rigorously as well.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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