Lights, etc. for small nano frag tank

So I bought this small 12 gal used nano tank -- nothing in the hood works.  I don't want to use the hood anyway.  I'm going to use this for my first small frag tank!  Does anyone know if there are inexpensive clip on lights for a tank this small?  The outside measurement is only 14 inches wide.  I only plan to have softies as frags.  My corals are growing too rapidly in my Biocube so I need to think about thinning them, and since I know I want a large tank about yr end I've decided to makeup a little frag tank.  Also, I don't intend to put any sand in the tank.  Do I need to keep a fish in there for any reason? I'd rather not even use live rock unless someone tells me I need to.  I'm thinking weekly water changes and just carbon and floss in the back along with a decent pump and a powerhead.  And I suppose if I start seeing algae a small CUC?  Is there a chemical I can use to cycle the tank if I don't want sand, liverock, etc? 

Thanks for the info!  I'll move some of my LR over from my biocube -- have too much in that tank anyway.  Now I just need to figure out the lighting!  Dang I'm addicted to this hobby already!