what size light

[puffer21]

Im upgrading to a 29 gallon tank. I need to know what lighting size to get. The tank is 30inchs long and these lights only come in 24' or 36' which size do i get. Here is the light unit i want thanks for any help puffer21.

http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=12113&N=2004+113352

[UnderwaterExotic]

Depends on what you are planning on keeping! Also depends on your lighting you want!

[puffer21]

well an anemone and mabye some Soft and hard corals also a clam. but my problem is neither lighting is the right size.