I suggest get a book and take a look at whats out there and what you want. For corals a great book is aquarium corals by eric bohreman. Last name may be misspelled. In general you should pick a group you like sps,lps, or softies and stick with them. I like lps alot of cool corals and dont need as great of water quality as sps. Hammers are cool, frogspawn, brains. These are pretty easy to keep. Another good book is the concientious marine aquarist. I am about to set up a 75 with refugium I have 2 175 watt halides 14000k. That would be sufficent lighting for most corals besides some sps. Read read read. Dont just get advice from one source.