If I get a bunch of new frags at once I start the rack low and then creep it up over the course of a few weeks. It gets a little trickier if I have some frags in the rack, and then buy a few more. I think I decided in that case I just start everyone back at the bottom. Then sometimes if I buy just one frag I won't use the rack at all, I just stick it in the sand and then slowly bring it up the rock work if I have a good idea about where I want to place it. My general idea though is to start the frags low and bring them up slowly.