Hi, I have a 30 gallon aquarium which currently houses 1 green chromis, 2 clowns fish, a royal grammar and a scooter blenny. I also have 4 trochus snails, 5 dwarf hermit crabs and a cleaner shrimp. I am looking for a centre piece with the wow factor... The corals I have so far are a small toadstool, open brain coral, small photosynthetic gorgonian and a frogspawn drag of 1 head. Any suggestions will be much appreciated.