I do see one National Geo Led that is reef capable... Yea good light is very important to sucess. Double check you dont have the fresh water version.So what lighting, exactly, is recommended?
@BoneXriffic its not marked marine but has the correct spectrum it seems.
http://www.petsmart.com/fish/lights...ed-track-hood-zid36-27508/cat-36-catid-300073
With light like that you probably dont want a very deep tank 22-24in. Current orbit marine are similar(i have one), for a standard 20 or 30 gal it probably pretty good. The version one is wildly unpopular(snobbery) and can be picked up pretty cheap if if you need to replace yours.
With the current in a 20 gal your ok to get almost anything. with your assuming it is marine Id say and low to med light corals.
I like this article too.It tells you more why and not all what.
It does say Zoas, but they are referring to hardier strains. The fancy ones are tricky.
http://successfulreefkeeping.com/learn/about-corals/best-beginner-coral-choices/



