That won't work. Linkias eat bio-film and possibly sponges, they don't filter-feed. Whatever product you've been given may work for corals and possibly some filter-feeding invertebrates, but not all- quite a few filter-feeders require food of a specific particle size and can't eat anything that isn't exactly right.
You may have been given some sort of dried phytoplankton, but honestly, your LFS guy is either badly misinformed or outright lying in order to sell you something. Anemones are best fed large chunks of meaty foods like shrimp and fish, which mimics their natural diet of whatever they can catch, and I don't think anybody's figured out a prepared food for linkias.