for nano reefers....check out this site www.nano-reef.com, it's a good site for u...
for nano tanks, the system is the opp of big tanks...for nano tanks, keep your system as simple as possible...a protein skimmer and a cannister hook up will do...when i was keeping my 2ft nano...i dun even use a protein skimmer..just a cannister with biohomme and filter wool inside...
for maintenance wise, use NSW or distilled water from ntuc...do small water change...not more than 10% each time or less than one inch of your water level.
allow your tank to cycle for one month...if u can't wait, dose bacteria and let it settle for one week...
and lastly, do not introduce too much fishes / corals at one time...have to do it slowly week by week...
if u do it well, u can make your tank look like this...