The cnidarians include corals, sea anemones, jellyfish and hydras. Cnidarians include corals, sea anemones, jellyfish and hydrozoans. These are most common in corals, sponges and sea anemones. Hexacorals include sea anemones and hard bodied corals. Here, among algal encrusted rocks live sponges, echinoderms, polychaete worms, sea anemones and other invertebrates. The polyps resemble those of closely related anthozoans, such as sea anemones and corals. Rock pools contain sea anemones, blennies, crabs and molluscs. It shows marine life including wrasse, jellyfish, sponges, sea anemones and rays. As cnidarians, sea anemones are related to corals, jellyfish, tube-dwelling anemones, and "Hydra". Hexacorallia includes coral reef builders&colon; the stony corals (Scleractinia), sea anemones (Actiniaria), and zoanthids (Zoantharia). Hundreds of animals, such as sea anemones, barnacles, and hooked mussels, inhabit oyster reefs. However, most species feed on coral polyps and sea anemones. Flowers mostly orchids, poppies, primulas, marigold, daisies and anemones carpet the ground. Keepers are generally advised to avoid eels, tangs, triggerfish, squid, octopus, and sea anemones. There are also abundant tide pools with a variety of molluscs, sea anemones and fish.