Dano,
One concern I have is that when you remove this live rock and crud from the system is that your water is going to get very dirty and even if you perform a huge water change you might get a lot of buildup on your sps. You may want to house the sps in a seperate holding tank for a day or two while you do this, or at the very least give everything a super blast with a baster and monitor it quite often-just a thought I had after removing/treating all my LR for hyrdoids last year.
Goodluck and hope all goes well
