I was just reading a slew of articles about feeding phyto since I just got a clam...let me see if I can find the links....there are some on that link I gave above, of course that is DT's site but the articles are by R. Shimek. I think in a nutshell, DT's is live and is whole cells that are of size that most filter feeders can handle. Kent products are dead cells that may or may not be intact cells, could just be cellular debris and could clump forming particle sizes that are unusable by some inverts. Personally, I use Kent right now because my LFS
stopped selling DT's
But I'm going to suck it up and order some soon. I've also heard good things about Knop CoralVite F its a enriched yeast based product that is fairly cheap, and very concentrated, I will be ordering this soon too as my LFS
doesn't carry it either...its hard to believe that they don't carry all this stuff yet they advertise as being the largest aquarium store in the world....