Jamie, I agree that a nitrogen source is essential, but for the phytoplankton, I have to go with Knop's recomendation that they need phyto. Since I haven't done any side by side comparisons, I can't speak from experience. I had a clam for a year that grew well without additional feeding, but it did really well after starting with DTs. Of course that was about the time I hooked up my Ca reactor, so who knows. Popular opinion in the clam forum of RC is that they unarguably need feeding. I feed DTs anyway, so better safe than sorry.
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Brad
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