Make sure you get t5 high output lighting. What are you plannin on keeping? Most things can be kept under t5ho. As for a chiller it really depends on the temp your house gets. I keep my tank 20g in an air contioned building and also have a a fan blowing on it 24/7 to keep the temp constant. That tank sits at around 82 degrees. In my personal opion you can get away without having a protein skimmer if you keep up on the 10% weekly water changes and don't have your tank overstocked or overfeed. As for how much flow you need in your tank will depend on what type of coral you keep. If you keep sps you will need much more flow then if you keep soft coral.
My best advice i can give though is do a lot of reading before you start. I researched over a year before i started my tank, and i still read on the hobby since i began the advanture of keeping a reef. This hobby is ever changing and there are always new and improved ways of keeping all of your fish, corals, and inverts much happier.
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CollegeReefer
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