if the clam is a crocea be careful about direct feeding as this can clog the gills of the clam. usually it isn't neceaasry to direct feed any clam. Bowl feeding if the clam has not attached or using the coke bottle hat method is really best. Also in feeding it is best for the clams health to use a live based phyto. Chromaplex, phytoplex are all dead besed food sources and are not that nutritionally sound. Barry at Clamsdirect suggests PhytoFeast.