Aquarium animals need food. Some of the nicest and most interesting animals in the ocean are the large benthic filter feeders like corals, clams, sea squirts, peacock worms, sponges and others. Filter feeders here in the northern regions don't have symbiotic algae that help them cover their energy needs. They need all their energy from food. They are also adapted to feeding continously rather than in "bursts". On these pages you can read about my experiments with growing plankton food for such animals.