On the coralife lights, it depends on which legs you get, as well as which light, but generally 3" to 5". IMO that is not enough, especially if the light has PC lights in it.
That is what I was afraid of, my tank is only 1 gal and the fixture I was "looking" at is the coralife 9" Aqualight 18 watt.
I don't want to cook everything in the little tank so I think I should just stay with my 7 watt 50/50 or maybe even the 10 watt coralife pc
[hr]
in.
Thanks for the info though, muchly apprecited