I am on the same hunt
Coralife makes a slim T5, maybe that's what you're referring to, but the smallest size is 24"
Here's a link to a great post re: 10 gallon lighting, namely a 20" Coralife PC but you'll have to switch out the bulbs (comes w/a saltwater bulb only):
http://www.plantedtank.net/forums/lighting/51187-lighting-system-10-gallon.html
Here's a link to a great post re: 10 gallon lighting, namely a 20" Coralife PC but you'll have to switch out the bulbs (comes w/a saltwater bulb only):
http://www.plantedtank.net/forums/lighting/51187-lighting-system-10-gallon.html