My orange serpent star and cleaner shrimps go crazy when I add a few drops of Liquidlife Bioplankton, Liquidlife Coral Plankton, or Tahaitian Blend. They come out of hiding and swim towards where the drops entered the tank. I didn't get the same response from DT"s phytoplankton. But that could be because the serpent star and cleaner shrimp are scavengers and prefer the smell of dead plankton.
Anyhow, I dose my tank Bioplankton, CoralPlankton (w/ Rotifers and phytoplankton), MarinePlankton (w/ Cyclopeeze) and Tahaitian blend once in a while. I just bought Oyster eggs and will give that a try. I read that cyclopeeze, rotifers, and oyster eggs were popular foods for flowerpot corals.
http://www.advancedaquarist.com/2005/10/aafeature2