· I've got the REEF rash!
+1.If the LR is going to be out of the tank very long you may consider making SW to sit it in like in a rubbermaid tub. You may think about using a turkey baster to blast out the rocks while they are still in the tank. You may be surprised what all is in there. ANother thing to consider is adding a rock lift to keep the rock off the substrate. If rock has to be piled against the back glass you may have more rock than you need.
I would do a big waterchange while you do this.
If it were me.... I might be tempted to just suck the CC out and replace with sand or go barebottom and be done with the CC.