How slowly should and frag rack be raised?

[Dw79]

Brought home a few frags the other day. They are currently in the sand, but going to place them into a frag rack. How slowly should the frag rack be raised to get them light acclimated up to the hight in the tank I want them ?

 

[rozart]

Raise the frag rack every 2 days.

 

[Dw79]

Ok, is an inch or two at a time about right?