We carry top quality coral and invertebrate food blends for the staple dietary needs of your aquarium filter-feeders. These liquid concentrations are either plankton or some blend of plankton and natural marine foods; we also have live food for filter feeders in the form of reef bugs and brine shrimp eggs which can be cultured for feeding. You may want a manual feeder made for liquid feeding. Turn off UV sterilizers at feeding time to avoid killing live food!