For 55-gallon tank
4 Sea anemones (Condylactus, Calliactis, Bunodactis, Ceriantheopsis, species as available).
2 Starfish (Echinaster/ Luidia/ Astropecten)
4 Brittlestars (Ophioderma)
4 Sea urchins (Arbacia/ Lytechinus)
2 Colorful and hardy sponges (Axinella/ Xestospongia/ Cliona)
2 Sea whips (Leptogorgia)
8 Living shells or rocks (Chitons/ Feather Duster Worms/ Serpulids/ Boring Sponges/ etc.)
3 Sea Cucumbers (Pentacta/ Thyonella)
2 Whelks or Conchs (Busycon/ Pleuroploca/ Fascioloria)
2 Bi-Valves (Mercenaria/ Chione/ Noetia/ Aequipecten)
1 Bryozoan (Schizoporella/ Bugula/ Amathia)
1 Cluster Tunicate (Styela)
2 Compatible Fish
2 Hermit Crabs (Clibanarius/ Pagurus)
1 Algae