Sounds like the typical meltdown type issues. Just try to frag what you can. Act quickly, because it spreads fast and they all start to rot.
Oddly I have these symptoms all the time when I move them...move a Hydor in a new direction....(stupid fish pushes the rock into new spot )
I sorta want mine to melt down on the wall...pointed a Hydor at them for a week...all they did was look shorter and like a fly on the windshield...Held on tighter!