Frags - dumb question

[Coralgurl]

I'm using aqua-glue gel from red coral. I've seen what appears to be pink playdo stuff that seems to hold rocks and plugs. My frags are either just sitting on my lr or if I can find a hole, jammed in but I really don't like where they are at the moment and they are getting knocked over by the snails.

I'm just getting into sps, so I'm not fragging anything, guess a rack isn't necessary?