May be can try research on some marine inverts, very minimum light requirement..
Tube anemone.
http://www.advancedaquarist.com/issues/june2004/invert.htm
http://www.wetwebmedia.com/tubeanem.htm
Some Corallimorpharia like Pseudocorynactis/ Chocolate ball tip anemone
http://www.advancedaquarist.com/issues/oct2002/invert.htm
Fan Worms/ Feather duster
http://www.wetwebmedia.com/feather.htm
http://www.liveaquaria.com/product/prod_display.cfm?c=497+504+1633&pcatid=1633
Cheers and Happy Reefing...